Polio Infected Siblings and Neighbors
Dr. Bruno’s Post: From THE POLIO PARADOX:
“In 5% to 20% of households where poliovirus attacked one family member, another was also stricken. From 1909 to 1955 more than 2000 family members in over 1000 households were surveyed in which at least one person had polio. On average if one child in a household became ill he "shared" polio with one other sibling of similar age. Just over half of those who became ill were paralyzed, while the others had flu-like symptoms ranging from a fever, sore throat and nausea to a stiff neck and muscle pain. This "minor illness" was caused by the poliovirus but may never have been diagnosed as polio at all, or may have been called "abortive" or "non-paralytic" polio. In three-quarters of the households, the first case of polio was paralytic and the second was "non-paralytic."
Bottom line: there's about a 1-in-5 chance that if you had paralytic polio one of your brothers or sisters had non-paralytic polio and may not even have known it.
Note: The Polio Paradox by Richard L. Bruno, HD, PhD is easily available from Amazon, Barnes and Noble and your favorite bookstore.