‘The precise herd immunity threshold for the novel coronavirus is not yet clear; but several experts said they believed it would be higher than 60 per cent... Some countries - notably Sweden, and briefly Britain - have experimented with limited lockdowns in an effort to build up immunity in their populations. But even in these places, recent studies indicate that no more than about 7 per cent -17 per cent of people have been infected so far. In New York City, which has had the largest coronavirus outbreak in the United States, around 20 per cent of the city's residents have been infected by the virus as of early May, according to a survey of people in grocery stores and community centres released by the governor's office.’
Read here (Straits Times, May 29, 2020)
