Re:Flu shots. Those use the actual virus to teach your immune system naturally. But the process takes months and in that time the virus mutates. That’s why flu shots only have a 50% chance of working. Also not getting a flu shot has a 50% chance of working.
Re:Flu shots. Those use the actual virus to teach your immune system naturally. But the process takes months and in that time the virus mutates. That’s why flu shots only have a 50% chance of working. Also not getting a flu shot has a 50% chance of working.