You need two doses of the vaccine (Not one) to be effective (except for the JJ jab)
It won't stop you from catching Delta, but it will reduce hospitalization and deaths - exactly what the Flu vaccine does.
Few people realize this, but the Flu vaccine you take every year, is only 50 to 60% effective. Its main objective is NOT to stop you catching the Flu, but to boost your immune system, so there are less hospitalization and deaths.
