E. coli from animal contact or recreational water

Petting zoos, county and state fairs, agritourism farms, and school farm visits are a recurring source of paediatric E. coli outbreaks, and the failure modes repeat year after year.

There are well-established public health recommendations for these settings — separating animal areas from eating areas, providing properly designed handwashing stations rather than only hand sanitiser, supervising children, controlling what enters animal areas, and posting clear signage. Hand sanitiser is specifically inadequate against this organism when hands are visibly soiled.

An operator who put a food concession next to a goat pen with a single hand sanitiser dispenser and no handwashing station has departed from published guidance, and that departure is documentable.

Untreated or inadequately treated water is the other major route. Swimming in lakes and rivers subject to agricultural runoff, splash pads and pools with failed disinfection, private wells contaminated by nearby livestock, and municipal systems following a main break or flood event.

Public pools and splash pads are regulated, inspected, and required to maintain disinfectant levels — and those logs exist. A facility that cannot produce compliant chlorine records for the day you swam has a serious problem.

Municipal systems must issue boil-water notices in defined circumstances, and a failure or delay in notification is its own claim.

Raw milk and cheese made from it are a persistent source, and these cases are legally distinctive: the product is inherently what it is, so the analysis often turns on warnings, on whether the sale was even lawful in that state, and on herd-share arrangements designed to work around retail bans.

Some states prohibit retail sale entirely, some permit it with mandated warnings, and a sale in violation of state law is powerful evidence of negligence in itself.