According to Australian researcher-author Dr. Viera Scheibner, 90% of polio cases were eliminated from statistics by health authorities’ redefinition of the disease when the vaccine was introduced, while in reality the Salk vaccine was continuing to cause paralytic polio in several countries amidst an absence of epidemics caused by the wild virus. For example, cases of viral and aseptic meningitis, which have symptoms similar to polio, were routinely diagnosed and recorded as polio before the vaccine, but were distinguished and removed from polio statistics after the vaccine.