Interesting article about Covid in Africa:
https://www.sciencemag.org/news/2020/08/pandemic-appears-have-spared-africa-so-far-scientists-are-struggling-explain-why
https://www.sciencemag.org/news/2020/08/pandemic-appears-have-spared-africa-so-far-scientists-are-struggling-explain-why
several possible factors in play:Quote:
Although Africa reported its millionth official COVID-19 case last week, it seems to have weathered the pandemic relatively well so far, with fewer than one confirmed case for every thousand people and just 23,000 deaths so far. Yet several antibody surveys suggest far more Africans have been infected with the coronavirusa discrepancy that is puzzling scientists around the continent.
Quote:
Marina Polln of the Carlos III Health Institute in Madrid, who led Spain's antibody survey, says Africa's youthfulness may protect it. Spain's median age is 45; in Kenya and Malawi, it's 20 and 18, respectively. Young people around the world are far less likely to get severely ill or die from the virus. And the population in Kenya's cities, where the pandemic first took hold, skews even younger than the country as a whole, says Thumbi Mwangi, an epidemiologist at the University of Nairobi.
and there's discussion about allowed for herd immunity:Quote:
Jambo is exploring the hypothesis that Africans have had more exposure to other coronaviruses that cause little more than colds in humans, which may provide some defense against COVID-19. Another possibility is that regular exposure to malaria or other infectious diseases could prime the immune system to fight new pathogens, including SARS-CoV-2, Boum adds. Barasa, on the other hand, suspects genetic factors protect the Kenyan population from severe disease.
Quote:
If tens of millions of Africans have already been infected, that raises the question of whether the continent should try for "herd immunity" without a vaccine, Boum saysthe controversial idea of letting the virus run its course to allow the population to become immune, perhaps while shielding the most vulnerable. That might be preferable over control measures that cripple economies and could harm public health more in the long run. "Maybe Africa can afford it," given its apparent low death to infection ratio, Boum says. "We need to dig into that."