The interval between Moderna doses is 28 days; for the Pfizer vaccine, it's 21 days. Each dose of Pfizer's contains 30 micrograms of vaccine. Moderna went with a much larger dose of vaccine, 100 micrograms. It means the company is using a little more than three times as much vaccine per person as Pfizer is.

What are the possible side effects of the Moderna and Pfizer COVID-19 vaccines?

Possible side effects: Pain, redness, or swelling at the site where the shot was administered, and/or tiredness, headache, muscle pain, chills, fever, or nausea throughout the rest of the body. If these side effects occur, they should go away in a few days. A few side effects are serious, but rare.

How long does the protection from Pfizer and Moderna's COVID-19 booster vaccine last?

The most recent research from the CDC suggests that protection from the Pfizer and Moderna COVID-19 vaccines starts to fade around 4 months after a booster dose.

Does the COVID-19 vaccine reduce the risk of getting "Long COVID"?

Reseach is showing that people who are vaccinated, even with just one dose, tend to have lower rates of long COVID-19 after catching the virus than those who are unvaccinated.

Is it safe to take the Moderna, Pfizer-BioNTech, or J&J COVID-19 vaccine during pregnancy?

No safety concerns were found in animal studies: Studies in animals receiving a Moderna, Pfizer-BioNTech, or Johnson & Johnson (J&J)/Janssen COVID-19 vaccine before or during pregnancy found no safety concerns in pregnant animals or their babies.

Here's the key differences between Moderna and Pfizer vaccines: Leading vaccine researcher

Is the COVID-19 vaccine safe for pregnancy?

Vaccination is recommended for pregnant women to prevent COVID-19, including severe illness and death. COVID-19 vaccination is safe and effective when administered during pregnancy

Can you have the mRNA COVID-19 vaccine if pregnant?

Data have clearly shown that receiving an mRNA COVID-19 vaccine during pregnancy reduces the risk for infection, severe illness and death from COVID-19 among people who are pregnant.

How many times can I get COVID-19?

'A long-term pattern' According to some infectious disease researchers, Covid-19 reinfections are likely to become more common as time goes on and different variants continue to circulate—with some people potentially seeing third or fourth reinfections within a year.

Should you get the COVID-19 vaccine if you already had COVID-19 and recovered?

If I already had COVID-19 and recovered, do I still need to get a COVID-19 vaccine? You should get a COVID-19 vaccine even if you already had COVID-19. Getting a COVID-19 vaccine after you recover from COVID-19 infection provides added protection to your immune system.

How long could the COVID-19 virus linger in your body?

But for most infected people, virus levels in the body peak between three and six days after the original infection, and the immune system clears the pathogen within 10 days. The virus shed after this period is generally not infectious.

How long do COVID-19 vaccines last?

It is normal for virus-fighting antibodies—such as those that are stimulated by a COVID-19 vaccine—to wane over time. Monitoring antibody levels in the blood is one way to measure vaccine efficacy and research has found that protection remains high for six months after the second shot of a Pfizer or Moderna vaccine.

How long does COVID-19 rebound last?

So far there have been no reports of severe illness in those who have experienced covid rebound, and most people seem to recover and stop testing positive around three days later without needing additional covid-19 treatment.

How long does it take for immunity to wane after receiving the COVID-19 vaccine?

A study published by the U.S. Centers for Disease Control and Prevention found that immunity against severe COVID-19 begins to wane four months after receiving a so-called "booster" third dose of the Pfizer or Moderna vaccines.

What are the possible side effects of the Moderna COVID-19 vaccine?

Possible side effects: Pain, redness, swelling in the arm where the shot was administered; tiredness, headache, muscle pain, chills, fever, nausea throughout the rest of the body. If any of these side effects occur, they should go away in a few days.

What are the common side effects of the Moderna COVID-19 booster vaccine?

The most commonly reported side effects by individuals who received a booster dose of the Moderna COVID-19 Vaccine after completion of a two-dose primary series were pain, redness and swelling at the injection site, as well as fatigue, headache, muscle or joint pain and chills.

Has anyone had severe reactions to the Moderna COVID-19 vaccine?

Monitoring of the Moderna COVID-19 vaccine has found 10 cases of anaphylaxis after the administration of 4,041,396 first doses of the Moderna COVID-19 vaccine. In 9 out of these 10 cases of anaphylaxis, the recipient of the vaccine had onset of symptoms within 30 min of administration.

Can you get COVID-19 if you already had it and have antibodies?

It is important to remember that some people with antibodies to SARS-CoV-2 may become infected after vaccination (vaccine breakthrough infection) or after recovering from a past infection (reinfected).

Can you still test positive after recovering from COVID-19?

According to the Centers for Disease Control and Prevention, some people who contract COVID-19 can have detectable virus for up to three months, but that doesn't mean they are contagious. When it comes to testing, however, the PCR tests are more likely to continue picking up the virus following infection.

Is it recommended to get the COVID-19 vaccine for previously infected individuals?

Although both previous infection and vaccination were found to significantly protect against COVID-19 infection, vaccination in previously infected individuals provided additional protection against symptomatic COVID-19 only among those who received the vaccine several months after the initial onset of the disease.

How strong is immunity after a COVID-19 infection?

How Strong Is Immunity After a COVID-19 Infection? About 90% of people develop some number of protective antibodies after a COVID-19 infection, according to the CDC. But how high those levels climb appears to be all over the map.

Does your immune system get stronger after COVID-19?

Any time you catch a virus and recover from the illness, you retain antibodies. These antibodies help your body fight off future infections so that you either don't get sick or have milder symptoms.

Are repeat COVID-19 infections common?

It's starting to seem like that might not be the case. Once again, infections are steadily rising in the US. Some people are catching Covid for a second, third or even a fourth time. Having recently gotten ill seems to no longer be a guarantee you're protected against Covid for any length of time.

Can mRNA-vaccinated mothers pass COVID-19 antibodies to babies?

Breastfeeding babies safely receive COVID-19-neutralizing antibodies from their mRNA-vaccinated mothers. COVID-19 vaccination is approved for children 5 years and older, but younger children and babies are also susceptible to infection.

Has the COVID-19 vaccine been tested on pregnant women?

Evidence continues to build showing that COVID-19 vaccination before and during pregnancy is safe and effective.

Are pregnant women more at risk of serious illness from COVID-19?

If you are pregnant or were recently pregnant, you are more likely to get severely ill from COVID-19 compared to people who are not pregnant. Pregnancy causes changes in the body that could make it easier to get very sick from respiratory viruses like the one that causes COVID-19.