A vaccine increasing the chance of getting a disease can be a problem with certain vaccines to certain diseases (e.g. dengue). There have been occasional suggestions of this happening with the flu va… (View Post)
Or the people who are "just asking questions", who always seem to ask the same questions beloved of anti-vaxxers and who ignore the million times those questions have been answered before. (View Post)
It depends on the vaccine. For example, with flu vaccines, where we have to guess what strains will be prevalent each year, sometimes they get that wrong and effectiveness falls. That happened in the… (View Post)