Frequently Asked Questions (FAQs)


What is COVID-19 and how can we help prevent the spread?

How does COVID-19 spread?

COVID-19 is spread when people touch or breathe in droplets made when ill people cough, sneeze or talk. This can happen when someone is close to a sick person, within six feet. Rarely, people might catch COVID-19 by touching a surface that a person with the infection coughed or sneezed on, and then touching their own mouth, nose or eyes.

It’s important to note that person-to-person spread can happen on a continuum. Some viruses are highly contagious (like measles), while other viruses are less so.

Can someone who has had COVID-19 spread it to others?

The virus that causes COVID-19 is spreading from person-to-person.  That is why Centers for Disease Control (CDC) recommends that these patients be isolated either in the hospital or at home (depending on how sick they are) until they are better and no longer pose a risk of infecting others.

How long someone is actively sick can vary so the decision on when to release someone from isolation is made on a case-by-case basis by public health and their health care provider in accordance with CDC guidance.

Click here for current CDC guidance 

Someone who has been released from isolation is not considered to pose a risk of infection to others.

What are the symptoms of COVID-19?

People with COVID-19 have had a wide range of symptoms reported – ranging from mild symptoms to severe illness. Symptoms may appear 2-14 days after exposure to the virus. Anyone can have mild to severe symptoms.

Possible symptoms include:

  • Fever or chills
  • Cough
  • Shortness of breath or difficulty breathing
  • Fatigue
  • Muscle or body aches
  • Headache
  • New loss of taste or smell
  • Sore throat
  • Congestion or runny nose
  • Nausea or vomiting
  • Diarrhea
This list does not include all possible symptoms. 
Symptoms may change with new COVID-19 variants and can vary depending on vaccination statusOlder adults
 and people who have underlying medical conditions like heart or lung disease or diabetes are at higher risk for getting very sick from COVID-19. 

What should I do if I believe I have been exposed to COVID-19?

If you have symptoms like a cough, fever or breathing problems and you might have been exposed to COVID-19, please contact your health care provider. Your provider will ask you about your symptoms and will decide whether you should be seen in the office. You can also take a COVID-19 test. 

If the doctor asks you to come in to the clinic, they may create a plan for you to enter the facility in a way that avoids being around others, to prevent the spread of illness.

There is information for people who have had close contact with a person confirmed to have, or being evaluated for, COVID-19 available online at the CDC website.

How can I avoid getting sick?

Steps you can take to prevent the spread of flu and the common cold can also help prevent the spread of the coronavirus COVID-19.
  • Wash your hands often with soap and water. Use hand sanitizer if you don't have access to soap and water.
  • Avoid touching your face, especially eyes, nose and mouth.
  • Stay home if you are sick. Avoid contact with people who are sick.
  • Cover your coughs and sneezes. Throw used tissues in the trash promptly.
  • Take care of your health by eating well, getting adequate sleep, exercising and managing stress will also help your body stay resilient.
  • Get vaccinated for COVID-19

Why should I use a face covering to prevent COVID-19?

There are detailed recommendations for healthcare providers to protect themselves using special types of masks and other equipment.

Oregon Mask Requirements

We wear face coverings to help slow the spread of COVID-19. Face coverings help us keep our respiratory droplets to ourselves, which means people who wear them prevent spreading the virus to others.   Some people are contagious before they ever get symptoms and some never feel sick. They can spread the disease unknowingly.  Once you have a viral infection, wearing a face covering does not make it worse or make it last longer. It does, however, help you keep from spreading or passing it on it to others.

There are many types of face coverings, scarves, bandanas, and homemade coverings with loops that go over the ears.  Be sure your face covering fits well and covers your nose and mouth.  Wash your hands before and after touching your face covering and wash it daily.

Face coverings don’t cause enough carbon dioxide build-up to cause ill effects in otherwise healthy people. In fact, masks have a tighter seal than face coverings, and farm workers, custodial staff, and hospital employees all wear them to stay safe in their workplaces.

Remember, though, that the following people should not wear face coverings:

• Children under age 2 years

• Anyone who has a medical condition that makes it hard to breathe when wearing a face covering.

• Anyone who has a disability that prevents the individual from wearing a face covering.

How can we help prevent the spread of COVID-19 in our community?

Get vaccinated for COVID-19

In addition wearing a face covering is one of the best way to prevent the spread of COVID-19 in our community.  Face coverings reduce the chance that you could unknowingly spread the virus to those around you.

Following other recommendations like frequent hand washing, hand sanitizing, regular cleaning of high touch surfaces, maintaining 6' of physical distance and not touching your face (eyes, nose and mouth) can all help prevent the spread.

The CDC has provided guidance for how individual households, schools, child cares, colleges/ universities, community- and faith-based organizations, and workplaces can participate in keeping our community healthy. Everyone has a role to play! 

What are monoclonal antibody treatments?

COVID-19 treatments known as monoclonal antibodies have the potential to save lives and relieve the burden on our nation’s health care system. Monoclonal antibody therapies are now available in subcutaneous in addition to intravenous formulation.


How do monoclonal antibodies work?

Monoclonal antibodies treatments mimic our immune system’s response to SARS-CoV-2 (the infection that causes COVID-19) and are available to eligible, non-hospitalized patients 12 years and older with a high risk of progressing to severe forms of COVID-19 or being hospitalized.


Who is eligible to receive monoclonal antibody treatment?

People ages 12 and older and who weigh >40kg who:

  • Have tested positive for COVID-19
  • are experiencing mild or moderate symptoms of COVID-19
  • had first symptoms within the last 10 days
  • are considered high risk for going into the hospital because of age >65, weight, pregnancy, immunosuppressive disease or treatment or some other chronic illnesses. See the full list.


Who is eligible to receive post exposure prophylaxis with monoclonal antibodies?

People ages 12 and older and who are exposed or at high risk for exposure (such as in congregate settings) and are:

  • Incompletely vaccinated - i.e. unvaccinated or partially vaccinated
  • Fully vaccinated but expected to not have as strong an immune response because of immunocompromising illness or being on immunosuppressive medications.


Who give should this treatment?

Oregon Health Authority (OHA) encourages all providers to offer monoclonal antibody treatment to appropriate high-risk patients with COVID-19 infection or exposure to reduce the risk of hospitalization and symptomatic disease. The subcutaneous formulation can be administered by any qualified provider in the state of Oregon. Patients must be observed for 1 hour following administration because of the rare risk of anaphylaxis. Details on logistics and administration of this new product are available in the updated HHS playbook:

Is monoclonal antibody treatment available in Oregon?

One product (Casirivimab/Imdevimab) is currently available in Oregon through Health and Human Services (HHS) at no charge. It is effective against the Delta variant, which is currently the predominant variant circulating in Oregon. This product is available to ship now, in both intravenous and subcutaneous formulations. Two other products are available for commercial purchase directly through manufacturer and these are effective against the Delta variant. Click here to find treatment locations near you.

Is monoclonal antibody treatment effective in fighting COVID-19?

When used for treatment of mild to moderate COVID-19, Casirivimab/Imdevimab reduces the risk of hospitalization by 50% in clinical trials leading to authorization. Casirivimab/Imdevimab has been shown to reduce the risk of symptomatic COVID-19 by 81% when used as postexposure prophylaxis. Additional information regarding this data is available via the EUA Fact sheet for health care providers. (


Where can I get more information on using monoclonal antibody treatments?

Please contact [email protected] 

You can also review the CDC’s COVID-19 Monoclonal Antibody Therapeutics Communications Toolkit for health care providers, health system administrators, treatment sites and others.

How can I get tested for COVID-19?

COVID-19 Testing is now widely available.  Visit the Community Testing page for information on clinical and surveillance (asymptomatic) testing sites.

You can order home test through the federal government here

Clinicians can order COVID-19 testing at their discretion. Public Health approval is not needed for this testing. Factors to consider include patient symptoms, underlying medical conditions, and contact with confirmed COVID-19 patients.

Currently, there are two types of tests used locally that are approved by the FDA to diagnose active cases.

1.     A molecular RT-PCR test that finds genetic material.

2.     An antigen test that looks for specific proteins on the surface of the virus.


Antibody tests are a third kind of test and are not approved for diagnosis; as they don’t tell us if the infection is active or not.


New FDA approved tests are being added regularly. You can find more information about them here. Please consult with your medical provider to find the appropriate test for you.

Will Lane County Public Health investigate positive COVID-19 cases to see if it has spread?

Lane County Public Health is no longer making outbound calls to positive COVID-19 cases; if you have questions or need support, please call our non-emergency call center: (541) 682-1380.

More information including resources for isolation & quarantine is available on our Contact Tracing page.

Additional questions about COVID-19

Can I be evicted for non-payment of rent during the COVID-19 pandemic?

Please see the Long-Term Recovery / Housing, Energy Assistance & Social Services Recovery page for up to date information on eviction moratoriums and rental assistance.

Local legal resources for renters include:

Access the Law

Oregon Law Center

My employer said that I need clearance to return to work.

Lane County Public Health does not recommend back to work verification for any employee in Lane County.

Employees are encouraged to follow the advice of their healthcare provider. Oregon Health Authority guidelines state the employee should not be in the workplace until the following criteria have been met: 24 hours has passed since recovery  (defined as resolution of fever without the use of fever-reducing medications and improvement in respiratory symptoms); and at least 5 days have passed since symptoms first appeared. This will help reduce the strain on our medical and hospital systems.

Lane County Public Health cannot provide clearance for return to work.
You can find more information from the Bureau of Labor and Industries (BOLI) regarding sick time laws and other employer and employee resources.

I’m an employer. Will I be notified if my employee is being monitored or tested for COVID-19?

Patient privacy laws severely restrict the amount of information that public health officials can share about individual patients. Employees may choose to notify their employers. 

Oregon OSHA’s Temporary Rule Addressing COVID-19 Workplace Risks does require that employers have an employee notification process in workplace exposures. See OAR 437-100-0744(3)(j).

Note that Oregon OSHA guidance includes a model policy and indicates that current Oregon Health Authority rules require reporting of disease cases. 

What do I do if I have concerns about a business or individual not following State guidelines?

Business Complaints Through The State

If you have concerns that a business is not properly adhering to the State guidance, you can submit a form through Oregon Occupational Safety and Health Administration (OSHA) at

The Oregon Department of Agriculture (ODA) is the lead agency related to grocery and convenience stores. Consumer complaints regarding customer behavior or a lack of customer social distancing in the retail environment should be directed to:

Violations of the order can be treated as a class C misdemeanor, punishable by up to 30 days in jail and a $1,250 fine.

Local Compliance

Once you have reached out to these state agencies, if you would like to continue to pursue your business-related concern locally, you can contact the Lane County Non-Emergency COVID-19 Call Center at 541-682-1380 or email [email protected] We strive to be responsive with a strong emphasis on education.

Community members should refrain from calling 9-1-1 if they have non-emergency needs. If you have a complaint about failure to follow the State guidance that is not related to a business, please contact your local city government or law enforcement provider using their non-emergency phone numbers. If you live in unincorporated Lane County, please call the call center number during business hours.

I’m concerned about recent/upcoming travel.

The CDC is monitoring the spread of COVID-19 worldwide and how countries are responding to it. Check the CDC travel information for guidance on international travel. 

How can I help?

The most important thing that people can do is to get vaccinated for COVID-19 and encourage others to get vaccinated.

It is also helpful to continue to make healthy decisions and follow the guidance provided by public health regarding masking, social distancing, gatherings and staying home when sick.

What are other trusted sources of information related to COVID-19?


All Oregonians ages 6 months and over are eligible to receive the COVID-19 vaccine.  (Pfizer and Moderna for ages 6 months +; Johnson & Johnson for ages 18+)

Information on getting vaccinated in Lane County can be found here: Get Vaccinated

Will the vaccine will be mandatory?

There are no plans to mandate the COVID-19 vaccine by Lane County.  

Governor Brown has issued vaccine mandates for healthcare workers and state employees. 

Check with your employer if you believe these new mandates apply to you.

My permanent residence is in another state, but I'm staying in Oregon (student, multiple homes, staying with family, etc.). Can I get my vaccine in Oregon?

If you are currently residing in Oregon you may get your vaccine in Oregon.   

This includes individuals needing only a second dose or booster. 

Will I be asked about my immigration status to receive the vaccine?

No.  All eligible community members are able to receive a vaccine, regardless of your immigration and citizenship status. Vaccine providers should not be asking about your immigration status. The Biden/Harris administration has declared that all vaccine sites are sensitive locations and immigration enforcement agencies will not carry out operations at or near such facilities, which also include health care facilities and hospitals.

Testing and treatment for COVID-19 (including vaccination) will not count against you for the public charge test. 
The U.S. Citizenship and Immigration Services (USCIS) made a special announcement about this. Also, not all immigrants are subject to the public charge test.

I’m pregnant. Can I get a COVID-19 vaccination?

The Centers for Disease Control and Prevention (CDC) has recently strengthened its vaccine recommendation for pregnant people.  

COVID-19 vaccination is recommended for all people ages 6 months and older, including people who are pregnant, breastfeeding, trying to get pregnant now, or might become pregnant in the future. 

Pregnant and recently pregnant people are more likely to get severely ill with COVID-19 compared with non-pregnant people. Fortunately, severe illness from COVID-19 during pregnancy can be avoided by getting vaccinated. 

CDC COVID-19 Information for pregnant and recently pregnant people

If I’ve had COVID-19 and recovered, do I need to get the vaccine?

Due to the severe health risks associated with the disease and the fact that re-infection is possible, people may be advised to get a COVID-19 vaccine even if they have been sick with the disease before. According to the CDC, COVID-19 vaccination should be offered to people regardless of a history of COVID-19 infection.

What is the difference between a second or third dose and a booster shot?

A third dose is currently available for individuals who are moderately to severely immunocompromised and may not have built up an adequate protective immune response with their first series of vaccinations. Currently, the only authorized third doses are for the Moderna and Pfizer Comirnaty vaccines. The recommendation is for immunocompromised individuals to receive a third dose of the same mRNA vaccine at least 28 days after receiving the second dose in the series (for individuals 18 years and older for Moderna and 12 years and older for Pfizer Comirnaty).  

At this time, the CDC does not have enough data to suggest that an additional dose of the Johnson & Johnson vaccine would produce an enhanced immune response in an immunocompromised person. Another dose of Johnson & Johnson or an mRNA vaccine is not recommended for immunocompromised individuals who have already received the Johnson & Johnson vaccine. These recommendations will be reviewed as the data becomes available. 

A booster dose is for people whose immunity may be fading after they complete their first vaccination series.

More information on Booster Doses - OHA  

Do I need a COVID-19 vaccine booster?

Yes. Recent data suggest COVID-19 vaccine effectiveness at preventing infection or severe illness wanes over time, especially for certain groups of people,  such as people ages 65 years and older and people with immunocompromise.

The emergence of COVID-19 variants further emphasizes the importance of vaccination, boosters, and prevention efforts needed to protect against COVID-19. Data show that an mRNA booster increases the immune response, which improves protection against getting a serious COVID-19 infection.

CDC recommends one updated (bivalent) booster dose:

  • -For everyone aged 5 years and older if it has been at least 2 months since your last dose.
  • -For children aged 6 months4 years who completed the Moderna primary series and if it has been at least 2 months since their last dose.

Vaccination Records

I've lost my vaccination card, how do I get another one?

Your immunization was recorded in the state ALERT immunization record system. 

You can request a Electronic Vaccine Card through OHA

For Assistance: 

     211 or 866-698-6155 – If you need help filling out the form, assistance in other languages or general information about My Electronic Vaccine Card. 

     800-980-9431 – If you do not receive a link, OHA’s immunization registry staff can help. 
Monday - Friday, 9:00 AM - 4:00 PM 
[email protected]

Is my vaccine recorded if I received it out of state?

If you received your vaccine outside of Oregon it is unlikely that your vaccine provider was able to record that vaccine in the Oregon ALERT System   We encourage you to contact your primary care provider (in Oregon) who can add your proof of vaccination from another state into your ALERT history here in Oregon. If you need a record of your vaccine from another state you will need to contact your vaccine provider in that state.  

If you received your vaccine in any county in Oregon your vaccine should already be accurately recorded in the ALERT system. 

Updating your out-of-state vaccination record in ALERT helps us achieve our local vaccination goals and provides public health with a more complete picture of vaccinations in Lane County.

Vaccine Distribution and Appointments

Where can I be vaccinated?

Vaccines are available through healthcare providers, pharmacies and vaccine clinic events.

sit Get Vaccinated for more information.

Will I be required to pay or have insurance to receive the vaccine?

No. There is no cost for the COVID-19 vaccine and you do not need to have insurance. Some clinics or pharmacies may charge a copay. OHA and LCPH clinics do not. 

The vaccine will be covered by Medicare, Medicaid, and most private insurance. The cost of the vaccine will be covered for people who are uninsured.

How do I get vaccinated if I am homebound or need assistance with transportation?

If you are a homebound individual please call or email Lane County ([email protected] or 541-682-1380) and provide a minimum of your address and phone number. 


We cannot currently offer rides to vaccine clinics. If you are an Oregon Health Plan member and need a ride to get a vaccine, rides are free. You can call your CCO for assistance or contact RideSource to schedule at 541-682-5566, toll free at 1-877-800-9899, o r7-1-1 (TTY)

Vaccine Development, Reactions and Side Effects

Why should I get a COVID-19 vaccination?

Vaccination is a safe, effective and reliable way to prevent getting infected with COVID-19. It’s the best tool we have to help us end the COVID-19 pandemic in Oregon. By getting vaccinated, wearing masks, washing our hands, staying physically distant and avoiding large indoor gatherings we can help stop the spread. If enough of us get vaccinated, we can achieve community immunity and the virus will not spread quickly.

How soon after administration will the vaccine become effective?

Clinical trials measured the effectiveness of COVID-19 vaccines.

Moderna and Pfizer both have some effectiveness after one shot but require a second shot for maximum effectiveness.

The Moderna vaccine is 94% effective two weeks after a person receives the second shot. The Pfizer vaccine is 95% effective one week after the second shot.

In its review of Johnson & Johnson’s (Janssen) application, the FDA reported the vaccine was 66% effective for moderate to severe/critical COVID-19 in all groups across all regions studied starting at 28 days after vaccination. The observed efficacy in the United States was 72%.
“The best thing is that this one-dose vaccine was 85% efficacious in preventing severe COVID-19,” Paul Cieslak, M.D, medical director for communicable diseases and immunization, OHA Public Health Division.

How does the COVID-19 vaccine work?

The vaccines give our cells instructions for how to make a harmless protein that is unique to the virus. Our bodies recognize that the protein should not be there and build T-lymphocytes and B-lymphocytes that will remember how to fight the virus that causes COVID-19 if we are infected in the future.

Pfizer-BioNTech and Moderna vaccines, store the instructions in single-stranded RNA. These are called mRNA vaccines or messenger-RNA vaccines.

The Johnson & Johnson vaccine uses double-stranded DNA to store the instructions.  It is a viral vector vaccine

The CDC has additional information on how mRNA and viral vector vaccines work.
CDC mRNA COVID-19 Vaccines
CDC Viral Vector COVID-19 Vaccines

Are the vaccines interchangeable?

In general, primary series and additional primary doses should be with the same vaccine product (i.e., the same manufacturer).

Though Pfizer and Moderna vaccines are made the same way, people must get the same second dose from the same manufacturer of the first.

The Johnson & Johnson (Janssen) vaccine is a single dose vaccine.

Heterologous (mix and match) booster doses can be used in eligible recipients.

If you have questions or concerns about your individual health situation they should be discuss with your health care provider.

Are the COVID-19 vaccines safe?

Thanks to advances in medicine, scientists were able to create and test a vaccine quickly. The Food & Drug Administration (FDA) requires rigorous safety testing before it will approve any vaccine. Tens of thousands of people — including Oregonians — from many backgrounds, ages and communities of color, participated in vaccine testing.

What does Emergency Use Authorization (EUA) mean? In times of a public health emergency, like a pandemic, the FDA allows the use of certain life-saving drugs and treatments through Emergency Use Authorization. The COVID-19 vaccine was tested in tens of thousands of study participants, which generated enough data to convince the FDA that the vaccine is safe and effective, and the manufacturer producing the vaccine meets all safety standards.

Are any of the vaccines fully approved by the FDA? What is Comirnaty?

On August 23, 2-21 the U.S. Food and Drug Administration (FDA) granted full approval to the Pfizer-BioNTech mRNA COVID-19 Vaccine, which will be marketed as “Comirnaty.”

Under the newly granted FDA approval, Comirnaty will be available to all people ages 16 and older to prevent COVID-19 disease. Under Emergency Use Authorization, the vaccine will continue to be available to all individuals ages 5 and older, and a third dose will be available to immunocompromised people.

In Comirnaty’s journey to FDA approval, the agency reviewed vaccine effectiveness data from roughly 40,000 individuals ages 16 and older — half of whom received placebos — who did not have evidence of the COVID-19 virus infection within a week of receiving the second dose.

Based on this analysis, the agency determined Comirnaty was 91% effective in preventing COVID-19 disease. 

In addition to reviewing vaccine effectiveness data, the FDA also reviewed vaccine safety data. More than half of the clinical trial participants from the vaccine effectiveness study were monitored for safety outcomes for at least four months after their second dose of Comirnaty. An additional 12,000 recipients were followed for at least six months following their second dose.

Based on this study, the FDA determined that the most common side effects included:

  • Pain, redness and swelling at the injection site
  • Fatigue
  • Headache
  • Muscle or joint pain
  • Chills
  • Fever

The FDA also evaluated the risks related to myocarditis and pericarditis following the administration of Comirnaty. After a thorough review, the agency determined:

  • Risk is highest among men ages 12 to 17.
  • The symptoms appear within seven days of the second dose of Comirnaty.
  • Most symptoms clear up.

The FDA and the Centers for Disease Control and Prevention (CDC) will continue to monitor the safety of Comirnaty, specifically as it relates to long-term outcomes, through the robust vaccine safety monitoring systems in place in the US.

Even with full approval, health care providers must administer COVID-19 vaccines in accordance with all program requirements and recommendations of CDC, the Advisory Committee on Immunization Practices (ACIP) and the FDA. Therefore, off-label use of Comirnaty is not recommended.

Here is a brief timeline of Comirnaty’s (Pfizer vaccine) journey to becoming a fully approved vaccine in the US:

Click here for additional information Press Announcments from the FDA.


For more information visit:

FDA Website
OHA Website

Was the vaccine was rushed to market and was it adequately tested for safety?

COVID-19 vaccines have been evaluated extensively in large-scale clinical trials. FDA will authorize their use only after reviewing this data. 

For more information on the safety, effectiveness and vaccination trials, visit

Do the COVID-19 vaccines contain a live virus?

The current vaccines do not contain live virus.

What are the COVID-19 vaccine’s side effects?

According to the FDA, the most common side effects found in the COVID-19 vaccine trials included pain, redness or swelling at the injection site, fatigue, headache, chills, muscle pain and joint pain. For more information visit the CDC’s site: What to Expect After Getting a COVID-19 Vaccine

Side effects after the second shot may be more intense than the ones experienced after the first shot. These side effects are normal signs that the body is building protection and should go away within a few days.

So far, reactions reported after getting a booster shot are similar to those after the two-dose or single-dose primary shots. Most side effects were mild to moderate.

What if I have a bad reaction to my COVID-19 vaccination?

CDC and FDA encourage the public to report possible side effects (called adverse events) to the Vaccine Adverse Event Reporting System (VAERS) . This national system collects these data to look for adverse events that are unexpected, appear to happen more often than expected or have unusual patterns of occurrence.

Visit The CDC VAERS Webpage to learn about the difference between a vaccine side effect and an adverse event and how reports to VAERS help CDC monitor the safety of vaccines. Safety is a top priority.

We also recommend using the V-safe After Vaccination Health Checker to share your side effects with the CDC as part of ongoing vaccine safety monitoring.

Is it true the vaccine won’t help your body build immunity the same way getting the virus will?

The body builds immunity to COVID-19 in a different way with the vaccine than through infection.

The vaccine helps build immunity without having to get the disease, which can be serious and even fatal.

Are mRNA vaccines more dangerous than other vaccines? Can mRNA vaccines alter your DNA?

Messenger RNA (mRNA) vaccines appear to cause short-term side effects more often than many other vaccines. But these side effects do not appear to be lasting.  Moderna & Pfizer are both mRNA vaccines.

Messenger RNA (mRNA) vaccines work by teaching cells in the body how to make a protein that triggers an immune response, according to the CDC. Messenger RNA injected into your body will not interact with or affect your cells’ DNA. 

Are both doses of the COVID-19 vaccine the same amount? What about the booster dose?

For the two dose vaccines (Pfizer & Modern) both doses are the same amount.  Your immune response may be different to each dose.

Johnson & Johnson (Janssen) requires only a single dose.

The Moderna booster dose is a half dose; this means it is half the amount of the first or second doses of Moderna. This is the only difference.

There is no difference between the first, second, or booster does for the Pfizer vaccine

OHA FAQs on Booster Doses

Where can I find more information regarding vaccine development and safety information?