Are there any such vaccines that require boosting within a year?
Flu. We don’t even know if we’ll need boosters though and it may not even be accurate to call it a booster just like it really isn’t accurate to call the Flu vaccine a booster. The problem with RNA viruses is how fast they mutate. It’s not a booster so much as it is a new vaccine. We don’t have any answers yet. I just read that they’re getting ready to publish the data that determines how long antibodies remain but the virus will mutate anyways so even if you have high levels of antibodies, they might not fully recognize the virus anymore and as we see with Dengue fever virus infections, when antibody levels fall and you come into contact with a different phenotype of the same virus, ADE can happen. This happens naturally with Dengue incidentally and it could as easily happen with naturally acquired covid immunity as it does with vaccine acquired immunity. While we’re all waiting around for Covid to become a less deadly endemic version of itself, it could become much more deadly first and it probably will IMHO.