London Influenza Epidemic

Background. Influenza is an infectious disease caused by influenza viruses, typically characterized by seasonal epidemics and sporadic pandemics. Influenza A and B viruses circulate in humans and cause seasonal epidemics, with influenza A responsible for most severe illness. The 1557 pandemic was potentially the first time influenza was connected to miscarriage and death of pregnant women, a precedent relevant to claims about effects on pregnancy.

The Claimed 1761 London Epidemic. A legacy record asserts that a severe influenza epidemic broke out in London on 4 April 1761, afflicting practically the entire population and causing an unusual number of miscarriages and premature births among pregnant women. None of the supplied passages mentions London in 1761, an April 1761 date, or these outcomes, so the claim cannot be confirmed from the retrieved evidence.

Reconciliation with Contemporary Records. The supplied material offers no contemporary medical records for 1761 against which to reconcile the description. It does establish that influenza had been a recognized epidemic disease since at least the sixteenth century, and that links between influenza and miscarriage in pregnant women had been noted as early as 1557, but it contains no documentation of the alleged London outbreak.