An experiment using a black light has shown how quickly germs and viruses can be spread in restaurants when just one person is infected.
Hundreds of tourists were infected with COVID-19 on a cruise ship in Japan with a buffet on the ship believed to be where most people got it.
The new experiment simulates how far a virus can spread at a buffet venue by using a paint invisible to the naked eye to represent the virus.
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Conducted by Japanese state broadcaster NHK in liaison with infection experts, the video shows 10 people coming into the restaurant, with one of them “infected” with the paint.