I don't really understand why people make this argument tbh. There are some vaccines you have to take only once, some you need to take three times, some you need to refresh every 10 years. This goes for plenty of tried and tested vaccines.
Now with Covid we're still figuring this out. Why do some antivaxxers act like having to take three doses means it's bullshit? We don't know yet what is best and how long it works.











