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Speaking as dangerous as coughing: New COVID-19 study


LONDON: Speaking to someone when infected with COVID-19 could be as dangerous as coughing near them due to tiny droplets known as aerosol particles, new research has shown.
COVID-19 can be spread via a number of routes, but research has shown that transmission is most common from aerosol droplets emitted when an infected person breaths, speaks or coughs.
This heightened transmission route, experts say, could help explain why the virus spreads more easily indoors or when there is poor ventilation.
Large droplets fall and do not pose a large risk of transmission, but aerosols can carry the virus over distances greater than 2 meters and remain for longer. ....

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LankaWeb – Natural coronavirus immunity could be TWICE as common as experts thought after Public Health England study claims millions have protective T-cells from catching similar cold viruses


The research, among 2,847 key workers from the NHS, police and fire service in June, found that 25 per cent of participants had high levels of T-cells which recognised Covid. 
That is far higher than the results of antibody surveys, which have consistently found no more than six per cent test positive for having had Covid. 
And it is likely to be even higher now that the country has experienced a second wave of infections.
Experts at Cambridge University’s MRC Biostatistics Unit estimate 7.37million people have caught the coronavirus already in England, and therefore would likely have immunity.
The PHE study, however, suggests the proportion of people with some level of immunity could be around one in four, which would equate to twice as many people at 14million or more. ....

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