Dear Sir,
Can anyone please explain why scientists have thankfully researched vaccines for diphtheria, tetanus, measles, chickenpox, hepatitis, polio, meningitis and tuberculosis, as well as flu and pneumonia?
Yet if one used any of the above vaccines, why did they not have to wear a mask and maintain social distancing, even after vaccination?
Why is it that we never heard of a vaccine that spr...
