Scott3:
Janssen Pharmaceutica (Johnson & Johnson): - On the virge of submitting emergency use authorization to the USA & likely to become the third approved vaccine in the USA. Single dose. Easier storage requirements. Sadly only 66% effective in preventing moderate to severe COVID-19 in trails. 85% Effective Overall in Preventing Severe Disease.
They are currently assessing whether the efficacy can be increased by offering a 2nd dose so it'll potentially just end up being like every other 2 dose vaccine.
I guess the problem soon is going to be testing vaccine efficacy for newer vaccines when Covid will rapidly start to die out.