“In Wuhan, where the virus first emerged, the whole population theoretically was at risk of becoming infected, but only 3% were.
“The Diamond Princess cruise ship represented the worst-case scenario in terms of disease spread, as the close confines of the ship offered optimal conditions for the virus to be passed among those aboard. The population density aboard the ship was the equivalent of trying to cram the whole Israeli population into an area 30 kilometers square. In addition, the ship had a central air conditioning and heating system, and communal dining rooms.
“’Those are extremely comfortable conditions for the virus and still, only 20% were infected. It is a lot, but pretty similar to the infection rate of the common flu,’ Levitt said. Based on those figures, his conclusion was that most people are simply naturally immune.”