Questions tagged [vaccination]

treat with a vaccine to produce immunity against a disease; inoculation.

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Taking the Covid19 vaccine from another country [closed]

I want to travel to China and take their Covid19 vaccine. I am currently living in the USA. Is this possible? In the USA, e.g., anyone can go to CVS at get a covid vax, without any documentation. Is ...
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COVID vaccines and autoimmune conditions

According to the CDC there are only two contraindications to receiving the COVID vaccine: Severe allergic reaction (e.g., anaphylaxis) after a previous dose or to a component of the COVID-19 vaccine ...
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Why is booster shot needed when mRNA vaccines can induce memory cells?

My understanding about mRNA Covid-19 vaccines and memory cell is that they do induce memory T cell response similar to natural infection, and thus provide long term protection via the memory cell ...
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How long does it take to develop severe side effects to the Covid-19 vaccines?

I am looking into getting one of the vaccines, but I'm worried about severe side effects. All the articles I have read online say unimportant side effects like fatigue, headache become apparent in a ...
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After vaccination did SARS-Cov-2 Spike (S) protein antibodies test - is my number big or small? [closed]

After vaccination with Chinese vaccines I did SARS-Cov-2 Spike (S) protein antibodies test. I was told if I had result more than 0.8 it means vaccine "worked". But I got result: 3.4. I am ...
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Are there any downsides in getting vaccinated with the Pfizer or Moderna COVID vaccine after having received the Johnson & Johnson's COVID-19 vaccine?

I read on https://www.usnews.com/news/health-news/articles/2021-07-01/reports-of-some-getting-pfizer-moderna-boosters-after-j-j-vaccine-prompts-calls-for-more-guidance (mirror): With the delta ...
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Why is the likelihood of fainting after the Johnson & Johnson's COVID-19 Vaccine 163 times higher than the likelihood of fainting after flu vaccine?

I read on https://www.cdc.gov/coronavirus/2019-ncov/vaccines/different-vaccines/janssen.html (mirror): Fainting After Vaccination Fainting (syncope) and other events that may be related to anxiety ...
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Why are mRNA vaccines not yet available against other diseases?

The mRNA vaccines against developing COVID-19 are obviously the first approved mRNA vaccines. We are probably at the beginning of an mRNA vaccine evolution. I've recently read a very interesting ...
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(How) does taking all available vaccines contribute to cross- and trained immunity?

Many countries have national vaccination campaigns that consists of vaccines against several different diseases. I expect that the choice of vaccines that are included in such programs is mainly ...
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If you've already been infected with SARS-CoV-2, do the vaccines cause fewer side effects?

Assuming that I had Covid-19 not so long ago. My body should have produced some type of antibodies to defend against the infection*. If I now get one of the vaccines, would it be more likely that ...
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Verify/calculate VE from study data

I’m trying to calculate the vaccine efficacy of a study in an effort to understand a bit more about the field but I can’t get to their result. Here’s what I’m doing:
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AstraZeneca total vaccinated up to this day

I'm trying to find answer to question in title but no luck. Is there any verifiable source that can give some estimation on number of people vaccinated with AstraZeneca up to this day?
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Factor-V-Leiden Mutation and COVID-19 vaccinations

When the thrombosis cases related to the COVID-19 vaccinations came up, I tried to assess my personal risk from my Factor-V-Leiden mutation. It was diagnosed when the whole family was screened, and ...
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Why aren't mRNA vaccines being updated for new variants?

From what I understand, updating an mRNA vaccine is trivial. According to this answer, no or small clinical trials would be needed to update the vaccine, and updating production would also be trivial. ...
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Is there any ground to delaying the second dose of of the mRNA covid-19 vaccine to reduce the risk of myocarditis?

Is there and could there be any benefit to delaying the second dose of the mRNA Pfizer covid-19 vaccine when it comes to reducing the risk of myocarditis associated with the vaccine? I'm quite sure ...
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Did the efficacy of any vaccines (>=90%) change after public vaccination began?

As I understand, efficacy was given after the 3rd trial. Pfizer and Sputnik-V had above 90% efficacy. I might have missed others, not sure. After being given to the public as part of vaccination ...
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Which vaccine has the least number of reported users getting infected even after vaccination?

I have been reading news about people getting infected with COVID-19 despite getting the AstraZeneca vaccine. I am not sure if it's similar with other vaccines. May I ask which vaccines have zero (...
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How should we interpret COVID-19 vaccines “efficacy”? [duplicate]

Different COVID-19 vaccines are said to have x% efficacy (x ~ 85%-95%). How should we understand this? There are several ways in which we could interpret this measure: Is it the expected percentage of ...
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Possible side effects of having 2 complete vaccines instead of one

If one wants to have two vaccines(Moderna after Sputnik), what are the best arguments to convince him not doing this? It is not studied yet, there are not enough data about unpredictable interaction ...
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Is AstraZeneca having better safety record than Pfizer or Moderna?

Recently, AstraZeneca vaccine got some bad press for few cases of blood clouts as side effect leading some countries to even suspend its use for people younger than 56 (see here). I am not a medical ...
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What is the state of transmissible vaccines?

I was thinking about viral gain of function research -- and firebugs playing with matches -- when it hit me: if a highly contagious, but harmless version were engineered it could outcompete more ...
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Covid-19 incubation period for vaccinated people

1The incubation period for covid-19 can be even something like 14 days. I guess this can be caused by having no specific immunity to this disease, so it takes some time for the immune system to react. ...
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Where can I find up-to-date information on the vaccine efficacy for different COVID-19 variants and the main COVID-19 vaccines?

I wonder if there exists some up-to-date information on the vaccine efficacy for different COVID-19 variants and the main COVID-19 vaccines (e.g., similar to COVID-19 cases trackers or COVID-19 ...
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Do mutations occur while growing virus for preparing inactivated viral vaccine?

The development of mutations in virus is reported to happen during replication, especially for an mRNA type virus like SARS-COV-2 Viruses that encode their genome in RNA, such as SARS-CoV-2, HIV and ...
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Scheduling second Pfizer vaccine

I've had my first Pfizer vaccine and the second is scheduled 11 weeks after the first one. I may have to postpone it though. If I cancel it, what is the latest date I can take the second dose without ...
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Blood count and adenovirus vaccines

Some covid-19 adenovirus vaccines including AstraZenca and Johnson & Johnson are found to have potential link to a rare albeit serious side effect resulting in blood clots with low platelets, ...
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What is meant by “vaccine efficacy?” [duplicate]

As a lot of people are aware, vaccines produced by different pharmaceutical companies have different “efficacy rates”:For example, this chart from the BBC which shows different rates of how effective ...
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Do people who were vaccinated against chicken pox need to be vaccinated against shingles? [closed]

Will people who never had chicken pox due to being vaccinated against it still need the shingles vaccine?
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Are the covid-19 vaccines more protective against severe disease and death than against simple infection?

I have frequently heard variations of the following claim: "The vaccination reduces your chances of getting covid, and even if you do get it, it is much less likely to be severe." I can't ...
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What cells and how many of those are infected and destroyed as a result of COVID-19 vaccine?

My understanding is that cells modified by COVID-19 vaccines will eventually get killed by immune system. Do we know what cells are usually targeted by vaccines and how many of those get killed as a ...
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Are there adverse health risks to taking multiple COVID vaccines?

Not counting the intended double dose of the 2-dose vaccines such as Moderna and Pfizer. I can imagine this in several instances. Say someone threw away their vaccine card after the second shot, and ...
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Do vaccinated people not have zero risk of mortality by Covid 19?

This video by Vox says people who are vaccinated have zero risk of mortality by Covid 19. But NDTV reports (at 00:21 and again at 07:53 in the video) that even fully vaccinated 8 frontline medical ...
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Is SM-102 a safe ingredient in the Moderna vaccine, despite these safety warnings?

I recently saw a post online which called into question the safety of the Moderna vaccine through an interesting argument. One of the ingredients in the Moderna COVID-19 vaccine is the ionizable amino ...
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Does antigen expression from an mRNA vaccine damage the host cell?

When mRNA (from a vaccine) enters a cell and the transcription process gets underway, the host cell effectively becomes an antigen factory. How does the antigen leave the cell so that it can trigger ...
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Why don't we have mDNA vaccines?

There are two differences between as vector virus vaccines and mRNA vaccines. One uses Adenovirus and the other uses Nano Lipid Particle(NLP) to deliver the gene material. One has DNA for the ...
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What exactly is the difference between Sputnik V lite and Astrazeneca vaccine?

As far as I know, both Astrazeneca and Sputnik V lite are Vector vaccines using an Adeno virus as a vehicle for the DNA of the spike protein of Covid-19. But Astrazeneca requires two vaccine shots ...
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Why do some vaccines cause flu-like symptoms? Why does this seem to be more severe in mRNA vaccines?

Flu like symptoms are noted as possible reactions on nearly every vaccine I've had since adolescence, but I've never actually seen these symptoms in myself or anyone, until now? I don't doubt that ...
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Antibody test after vaccination with BBIBP-CorV

After vaccination with BBIBP-CorV (inactivated) which of the following tests can be taken to determine if the vaccine produced an immune response: IgM for N protein IgG for N protein IgG for S ...
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Any known case reports of inadvertent i.v. administration of an adenovirus-based vaccine?

In connection with another question here (which discusses the theory that TTS effects in [Covid-19] adenovirus-based vaccines are due to i.v. administration error) let met ask: are there any known ...
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Were thrombocyte counts or bleeding events monitored at all during ChAdOx1 (AZD1222) clinical trials?

Maybe I'm just missing something, but on a quick look, I find it a bit strange that since issues with thrombocyte (platelet) counts in adenovirus-vectored therapeutics have (1) been known for about ...
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Is the decrease in vaccine uptake in the US for two weeks in a row in line with some models' expectation?

According to Reuters news of May 3, vaccinations have also fallen in the US for two weeks in a row. Nationally, deaths from COVID-19 fell 3% to 4,819 in the week ended May 2, the fewest deaths in a ...
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Would it be okay to have the Astrazeneca vaccine if I had dengue hemorrhagic fever as a child? [closed]

Although it happened more than two decades ago, I still remember being very ill, vomiting so much blood at one point. I was given an IV drip and had to stay in hospital for a while. Would having had ...
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What is the historical or scientific basis for concern about COVID vaccines and pregnant women and their babies?

There's a lot of talk about whether COVID vaccines are safe for pregnant women and their fetuses. Current guidelines, while mentioning that there's little data, suggest that they are safe. However, I'...
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When speaking of vaccine efficacy (for COVID-19, or other), is immune response or efficacy really being measured? [duplicate]

I've been performing many web searches using combinations of the words "vaccine", "vaccination", "COVID-19", "coronavirus", "efficacy", and "...
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Covid-19 and Original Antigenic Sin

My understanding of original antigenic sin, which I admit is minimal, is that with some pathogens, your immune system gets too focused on one variant and thus is wholly unprepared to deal with a ...
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Why does my volunteering with kids mean I should get a tetanus shot?

I volunteer with kids a decent amount. A little while ago my doctor recommended that I get the tetanus shot specifically due to the fact that I spend so much time around small children. At the time I ...
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Is there evidence that vaccine-related blood clots could be due to injection technique?

Recently, Danish health authorities including Denmark's SSI issued new guidelines for intramascular vaccination to be done with aspiration, in case some of the vaccine-induced blood clot cases are due ...
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Is there any data on herbal supplements interfering with the efficacy of vaccination?

Here's an excerpt from a paper published in "Journal of Inflammation Research" by Dove Press for a popular and controversial herbal supplement from India: Coronil effectively inhibited the ...
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On Td/Tdap Vaccine requirement

I'm given a vaccine requirement form. I have problem understanding the following requirement: Td/Tdap: YES, substitute 1-time dose of Tdap for Td booster; then boost with Td every 10 years On my ...
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what does 95% effectivenes mean for vaccines (covid) [duplicate]

Often we see in news they say AstraZeneca is 95% effective, while Chinese vaccine is 50%. I have question how to interpret these numbers. Does this mean that if you get vaccinated with AstraZeneca ...

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