Recently, as the news about COVID vaccine is everywhere, I'm seeing some similar stuff on many sites like "we will need yearly vaccine like other vaccines", "we would need covid vaccine like flu vaccine", "measles vaccine" etc.

Now the purpose of this question is not to discuss anything about COVID.

The thing is, I was born in a village life. People know very less stuff about health and vaccination. One common vaccine I know is of Polio. I don't know about any other vaccines.

So my question is, do we need other vaccines apart from Polio after birth and do we need to take them again after a certain time? This question came to my mind because I heard nobody near me going for vaccination after their childhood is over.

And I got intrigued very much because I read measles is airborne (something like that) and vaccination is the cure. And flu/influenza also needs vaccination. So I'm really really confused.

  • I put the title of your question into google and among the first hits was this, which completely answers your question. This is why we require questions to include prior research. – Carey Gregory Jul 11 at 0:11
  • @CareyGregory I didn't saw this article but read similar stuff before I got confused a lot. Actually I'm not sure if it's for everyone or it's just a luxury for rich people. Because most people in rural areas don't know about this stuff, at least in India. I think these online articles are not giving ideas about my confusion. – Vikas Jul 11 at 10:00

To get this out of the way: I'm not a doctor nor do I play one - please take everything with a grain of salt.

You are most likely not vaccinated against everything as a kid (why should you - for example against tropical diseases) however when you visit certain coutries as an adult (or kid) you should or need in certain cases get vaccinated before you enter.

There are certain vaccines that "expire" once you have them in your body.

Expire is probably the wrong choice of word, however if you get something like the "flu shot" you would need to renew it yearly because the flu mutates and evolves and might be a new virus when it comes around next time.

Also read up on how vaccines work, that will answer a lot of questions as well.

Basically and to oversimplify a vaccine infects you with a cripplet version of the virus, so that your body can produce antibodys agaist it (as if you were infected and cured with the disease) but you usually don't get sick, because your immune system is strong enough to deal with the less lethal virus with few or no symthoms and still produce the antibodies requiref to become immune.

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