Coronavirus Delta variant threatens new pandemic challenge

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The highly-contagious Delta variant is causing a surge in new Covid-19 cases even in countries with high vaccination rates and experts warn that inoculation campaigns are in a race against time to contain it.

For the moment the pandemic is still slowing down with the World Health Organization reporting the lowest number of new cases worldwide since February and decreasing deaths attributed to the coronavirus.

Delta is thought to be some 40 to 60 percent more contagious than Alpha, which itself is more contagious than the strain responsible for the first wave of Covid-19.In the United States last week 35 percent of positive tests that were sequenced were identified as the Delta variant, up from about 10 percent on June 5 -- numbers similar to what is being observed in Israel.

While several studies have shown that vaccines are slightly less effective against Delta, they are still highly effective. Recent data from the UK government shows that full immunization can offer about 96 percent protection against hospitalization and 79 percent protection against symptomatic infection by the Delta variant."One dose is not enough," says a public health notice from the ECDC, "full vaccination is needed to protect the most vulnerable.

 

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