....the Economist published an article today hypothesizing that Bats from area like Vietnam, which carry many Corona viruses, may be ground zero for the disease. These animals could then end up in wet markets via the sophisticated trade in exotic species....or end up there via intermediate species that have been infected.
The theory hinges on possible immunity against the disease in bat infested countries like Vietnam......which went through a weak lockdown....but has only registered 417 cases and 0 deaths in a country of 100 million people. Most of South East Asia has spectacular results suggesting some sort of immunity is at play.
The theory goes that the virus had to travel to a non immune area like central China to really flair up.....another way of saying the wet markets should be more strictly policed or closed down.
These observations support other findings that exposure to these viruses confer immunity through T cells, and suggest there may be wider immunity than believed. It also suggests that herd immunity can build rapidly in a population, consistent with the low rates of infection we are now seeing in places like NY, Italy and Spain which were being ravaged by the virus 3 months ago.
This has been ascribed to distancing practices, but may have more to do with local immunity. Perhaps a reason why new areas are now the epicenter for the disease.
There is a lot we still have to learn about this virus and our 19th century epidemiologists are still stumped.