WHO warns that few people around the world have developed antibodies to Covid-19
Only a tiny proportion of the global population – maybe as few as 2% or 3% – appear to have antibodies in the blood showing they have been infected with Covid-19, according to the World Health Organization, a finding that bodes ill for hopes that herd immunity will ease the exit from lockdown.
“Easing restrictions is not the end of the epidemic in any country,” said WHO director-general Dr Tedros Adhanom Ghebreyesus at a media briefing in Geneva on Monday. “So-called lockdowns can help to take the heat out of a country’s epidemic.”
But serological testing to find out how large a proportion of the population have had the infection and developed antibodies to it – which it is hoped will mean they have some level of immunity – suggests that the numbers are low. [Continue reading…]
Preliminary results from New York’s first coronavirus antibody study show nearly 14 percent tested positive, meaning they had the virus at some point and recovered, Gov. Andrew Cuomo said Thursday. That equates to 2.7 million infections statewide — more than 10 times the state’s confirmed cases.
The study, part of Cuomo’s “aggressive” antibody testing launched earlier this week, is based on 3,000 random samples from 40 locations in 19 counties. While the preliminary data suggests much more widespread infection, it means New York’s mortality rate is much lower than previously thought.
As of Thursday, nearly 16,000 people in New York have died of virus-related complications. With 260,000-plus confirmed cases, the mortality rate would be as high as 6 percent. With 2.7 million cases, it would be around 0.5 percent — much lower, though still much higher than the seasonal flu.
Cuomo was quick to caution, though, that that the death toll was higher than even the state’s own official report — it counts deaths in hospitals and nursing homes, but not at-home deaths or other “probable” cases. In other words, the mortality rate is still hard to determine properly.
New York City had a higher rate of antibodies (21.2 percent) than anywhere else in the state and accounted for 43 percent of the total tested. Long Island had a 16.7 percent positivity rate, while Westchester and Rockland counties saw 11.7 percent of their samples come up with the antibody. The rest of the state, which accounted for about a third of those studied, had a 3.6 percent positivity rate. There were early variations by race/ethnicity and age as well. [Continue reading…]