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The virus was formerly known as the Norwalk virus because the first known outbreak took place at an elementary school in Norwalk, Ohio, according to norovirus.com.

“Noro” is a relatively common name in Japan and elsewhere, and yet the norovirus, originally called the Norwalk virus after a 1972 outbreak in Norwalk, Ohio, has not been relabeled.

In developed countries, it’s rare for ice to be contaminated before freezing, but it does happen: In 1987, ice-borne Norwalk virus sickened more than 5,000 people in Pennsylvania, Delaware and New Jersey.

Virologists encountered other sensitivities with Norwalk virus, named for a city in Ohio.

More than a decade ago, scientists at Arizona State University created a biopharmed vaccine against Norwalk virus, the bug that annually causes millions of cases of diarrhea on cruise ships and in nursing homes.