I learned somethign new today.

I didn't realize that there were vaccines that protects against the disease but not against transmission.

I wish this article gave better examples (e.g. rotovirus is still thwarted by 90%), but this is a phenomenon that we need to understand.

Rats.

In an ideal world, all vaccines would induce sterilising immunity. In reality, it is actually extremely difficult to produce vaccines that stop virus infection altogether. Most vaccines that are in routine use today do not achieve this. For example, vaccines targeting rotavirus, a common cause of diarrhoea in infants, are only capable of preventing severe disease. But this has still proven invaluable in controlling the virus. In the US, there has been almost 90% fewer cases of rotavirus-associated hospital visits since the vaccine was introduced in 2006. A similar situation occurs with the current poliovirus vaccines, yet there is hope this virus could be eradicated globally.

Click here for link at https://theconversation.com/coronavirus-few-vaccines-prevent