Against the background of repeated outbreaks of coronavirus SARS-CoV-2, many regions and countries again impose restrictive measures. What role in the emergence of new foci of infection is its asymptomatic carriers?
Melbourne, Beijing, Leicester, Barcelona… all over the world continue to record new local outbreaks of coronavirus infection – often in places where before there was a significant decrease in the number of cases. As a result, local authorities are compelled again to tighten quarantine measures.
On 18 July, there were nearly 260 thousand new cases COVID-19: this was a record daily increase since the beginning of the pandemic. Although over the last few days the numbers have declined somewhat, much cause for optimism yet. Recent research suggests that young, asymptomatic carriers may play in the spread of the virus much greater role than thought until now.
One trip in the Elevator – dozens of people infected
At the American Center for control and prevention (CDC) reported on the unusual case when a woman who was an asymptomatic carrier COVID-19, infected a total of 71 people, after spending just a few minutes in the Elevator of her home in China. Woman in March, returned to China from the US and have a test for coronavirus, but he turned out to be negative. Despite this, she decided to abide by the quarantine, and claims that two weeks is only a short Elevator ride.
Japanese scientists from Kyoto University has also recently conducted a study, which traced the chain of more than 3,000 cases of infection. Experts managed to identify 22 people who are likely to become primary sources of infection. Every second of them were aged 20 to 39 years. This gave scientists a surprise, since most cases of infection recorded in Japan in a specific period were in patients aged 50-70 years.
Two-thirds of Americans with COVID-19 – younger than 60 years
While young people coronavirus detected more often. For example, the analysis of data gathered in the U.S. city of Seattle, showed that half of all new cases of infection with coronavirus occur in people aged 20 to 30 years. According to the American Center for control and disease prevention, nearly 70 percent of U.S. residents with a confirmed diagnosis COVID-19 were younger than 60 years.
How dangerous asymptomatic carriers?
In may the head of the CDC Robert Redfield has stated that symptoms may not occur in 25 percent of people infected. In turn, research conducted in Hong Kong and the UK showed that the proportion of latent carriers among the carriers of the virus and can be up to 50 percent.
However, while scientists have not reached consensus on whether asymptomatic carriers of a contagious and to what extent they contribute to the spread of SARS-CoV-2. Most experts are of the opinion that the risk of infection from a patient with obvious signs of coronavirus is still higher than that of the carrier of the infection, which they are not.
Protective mask as a basic precaution
The specialists believe that the priority method of combating the spread of COVID-19 still needs to be precaution – in particular, social distancing and the wearing of protective masks. In some regions, which has recently been a new outbreak of coronavirus – for example, in Australia, the authorities have recently ordered residents to wear masks in public places.
In Germany, by the way, these rules introduced at the end of April. According to one study, the wearing of masks reduces the chance of Contracting SARS-CoV-2 to 40 percent.
It is noteworthy that in June, the world health organization (who) have also updated the guidance on the wearing of protective masks and now advises to wear them in public places and enclosed spaces where it is difficult to provide social distance.
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