Physicians and public health officials know that recently vaccinated individuals can spread disease and that contact with the immunocompromised can be especially dangerous. For example, the Johns Hopkins Patient Guide warns the immunocompromised to “Avoid contact with children who are recently vaccinated,” and to “Tell friends and family who are sick, or have recently had a live vaccine (such as chicken pox, measles, rubella, intranasal influenza, polio or smallpox) not to visit.”

Both unvaccinated and vaccinated individuals are at risk from exposure to those recently vaccinated. Vaccine failure is widespread; vaccine-induced immunity is not permanent and recent outbreaks of diseases such as whooping cough, mumps and measles have occurred in fully vaccinated populations.   (Read More)