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Debunked, the myth of asymptomatic Covid transmission – The Conservative Woman

The concern that SARS-CoV-2 could be spread by people without symptoms originally came from a single case report. It was alleged that an asymptomatic woman from China had spread the virus to 16 other contacts in Germany. Later reports showed that, at the time of contact, this woman was taking medication for flu-like symptoms, invalidating the evidence provided for the theory of asymptomatic transmission. As with other common respiratory viruses, SARS-CoV-2 spreads by being exhaled, coughed or sneezed into the air. The largest droplets fall quickly and settle on the ground whilst the most lightweight particles, known as aerosols, may remain suspended in the air for days. Once the virus is present in the environment, it spreads by finding its way into the respiratory tract of new hosts in a large enough quantity (known as the ‘viral load’ or ‘infectious dose’) to infect them. The theory of fomite transmission (touching contaminated surfaces and then touching the face) is not supported by scientific evidence.

 …In asymptomatic individuals, the viral load is typically very low and the infectious period is also short in duration. They may still exhale virus particles, which another person may encounter. However, the overall likelihood of transmitting the disease to others is negligible. Thus asymptomatic cases are not the major drivers of epidemics. As Dr Anthony Fauci of the US National Institute of Allergy and Infectious Diseases stated in March 2020: ‘In all the history of respiratory-borne viruses of any type, asymptomatic transmission has never been the driver of outbreaks. The driver of outbreaks is always a symptomatic person.’ 

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Opinion

There is no reason why new variants should prevent us from reopening – Professor Robert Dingwall, The Telegraph

SARS-Cov-2 is a more stable virus than influenza. Trillions of replications have thrown up a handful of variants of concern, clustering around a small set of mutations. These variants are worth monitoring but the vaccines effectively prevent them causing serious illness. There is a theoretical risk of a more dangerous variant but it does not seem more likely than a shift in the influenza virus. If it were to occur, we could now manage it with short-term measures and rapid vaccine modification.

…Vaccination protects the vaccinated. It helps protect others but it means that we take no greater risk in the autumn of 2020 than in the autumn of 2019. Interventions should be proportionate to that – which means that most cannot be justified.

Some are worth retaining, like improved hygiene in public places or greater readiness to stay at home with respiratory symptoms. It is probably a good idea to invest further in the search for effective antiviral therapies. Promoting better population health through diet and exercise is always a good thing. But it is time for a bonfire of face masks and the despatch of lateral flow tests to landfill.

https://www.telegraph.co.uk/news/2021/05/29/no-reason-new-variants-should-prevent-us-reopening/