3 ms·
It becomes less effective after exposure to the virus. You can get it as an older patient, but it drops to under 50% effectiveness after exposure. Hence why th
by jimktrains2 6y ago
It becomes less effective after exposure to the virus. You can get it as an older patient, but it drops to under 50% effectiveness after exposure.
Hence why there is a push to vaccinate children before they become sexually active: the effectiveness is around 95%.
- tboyd47 6y agoIs that because those who have already been exposed possess natural immunity, making the vaccine less effective?