‘Herd Immunity’: the misplaced driver of universal vaccination

The term, ‘herd immunity’, was coined by researcher, A W Hedrich, after he’d studied the epidemiology of measles in USA between 1900-1931. His study published in the May, 1933 American Journal of Epidemiology concluded that when 68% of children younger than 15 yrs old had become immune to measles via infection, measles epidemics ceased. For … Continue reading ‘Herd Immunity’: the misplaced driver of universal vaccination