Tuesday, July 07, 2020

Mechanisms Of Covid Spread Still A Complete Mystery



SMH |  "The explanation could only be that these agents don't come or go anywhere. They are always here and something ignites them, maybe human density or environmental conditions, and this is what we should look for."

Dr Jefferson believes that the virus may be transmitted through the sewerage system or shared toilets, not just through droplets expelled by talking, coughing and sneezing.

Jefferson and Professor Carl Heneghan, director of the Centre for Evidence-Based Medicine, have called for an in-depth investigation similar to that carried out by John Snow in 1854, which showed cholera was spreading in London from an infected well in Soho.

Exploring why so many outbreaks happen at food factories and meat-packing plants could uncover major new transmission routes, they believe. It may be shared toilets coupled with cool conditions that allow the virus to thrive.

The Tonnies slaughterhouse in Germany was the centre of a major outbreak last month, and in May, Melbourne's Cedar Meats also recorded a cluster of cases.

"We're doing a living review, extracting environmental conditions, the ecology of these viruses which has been grossly understudied," said Dr Jefferson.

"There is quite a lot of evidence of huge amounts of the virus in sewage all over the place, and an increasing amount of evidence there is faecal transmission. There is a high concentration where sewage is four degrees, which is the ideal temperature for it to be stabled and presumably activated. And meat-packing plants are often at four degrees.

"These meat-packing clusters and isolated outbreaks don't fit with respiratory theory, they fit with people who haven't washed their hands properly.

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