Dr Jefferson believes that many viruses lie dormant throughout the globe and emerge when conditions are favourable. It also means they can vanish as quickly as they arrive.

“Where did Sars 1 go? It’s just disappeared,” he said “So we have to think about these things. We need to start researching the ecology of the virus, understanding how it originates and mutates.

“I think the virus was already here, here meaning everywhere. We may be seeing a dormant virus that has been activated by environmental conditions. 

“There was a case in the Falkland Islands in early February. Now where did that come from? There was a cruise ship that went from South Georgia to Buenos Aires, and the passengers were screened and then on day eight, when they started sailing towards the Weddell Sea, they got the first case. Was it in prepared food that was defrosted and activated? 

“Strange things like this happened with Spanish Flu. In 1918 around 30 per cent of the population of Western Samoa died of Spanish Flu, and they hadn’t had any communication with the outside world.

“The explanation for this 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 be looking for.”

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

Writing in The Telegraph on Sunday, Dr Jefferson and Professor Carl Henegehan, Director of the CEBM, call 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 meatpacking plants could uncover major new transmission routes, they believe. It may be shared toilet facilities coupled with cool conditions that allow the virus to thrive.

“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 that 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 meatpacking 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. 

“These outbreaks need to be investigated properly with people on the ground one by one. You need to do what John Snow did. You question people, and you start constructing hypotheses that fit the facts, not the other way around.”

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