Incoming possible Silly, Stupid and Lazy Questions, 1. Are there any vaccine ( of any Disease ) that are 100% effective? Or do we operate ( as I would assume ) something like 5 Nines effective rate and call it 100%? 2. Across all type of Vaccine, what are the average or median effective rate? i.e Should we expect Vaccine to be 90%+ effective in the first place? Or is that a wrong expectation to make? 3. What happens…
Superficially regarding number 2: on a population scale a lot depends on how contagious the disease is. The measles vaccine is very efficient (over 95% after two doses), but still requires something like a 90% vaccination grade to prevent outbreaks. Measles is very very very contagious. Covid is not nearly as contagious, so to prevent outbreaks it doesn't have to be nearly as good at the same vaccination grade. For a…
Agreed, but keep in mind that no one in the Oxford trial who got the vaccine got a serious case of COVID or needed to go to the hospital. So it's only 70%-90% effective (depending on dose) at keeping you from getting infected, but so far 100% effective at reducing severity and keeping you from dying or going to the hospital. So that's a huge positive to keep in mind and yet another reason to get vaccinated.