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Unlike the SARS-CoV-1 virus, which spreads most intensively in the second week of illness, Covid-19 spreads more rapidly in patients with a pandemic infection before the onset of clinical symptoms and in the first few days of the illness. It should be noted that high-risk contacts with asymptomatic people with Covid-19 account for at least 30 percent of all contacts. That is why various clubs, public food establishments, schools, workplaces, churches are becoming places of mass human infection.
In such hangouts, one person can infect multiple people, although superdistributors (when one person infects 10 or more people) are not that common. In closed communities (nursing homes, shelters, detention centers, prisons), the infection rate is also very high. Studies show that between 60 and 80 percent of people in gated communities can become infected. population.
Investigating high-risk contacts is very important. A study conducted by Chinese researchers shows that 105 out of 1015 high-risk contacts of Covid-19 in the home environment were infected, that is, out of 10 high-risk contacts in a medical institution, 7 out of 679 high-risk contacts in a medical institution, that is, 1%, 11 out of 875 high-risk contacts in leisure facilities and workplaces, that is 1.3 percent, of which 818 were infected in public transport, or 0, 1 percent. Living in one house, and especially eating together, are becoming major risk factors for the spread of Covid-19 infection.
As already mentioned, the infection from one family to another spreads effectively. Studies show that 17 to 38 percent of Covid-19 risk exposures and 46 to 66 percent of all secondary infections with this infection occur in the home environment. A study of 59,000 people in South Korea found that SARS-CoV-2 infections in the home environment were six times more common than during other Covid-19 contacts. Spouses are twice as likely to be infected as other adults living together. Studies show that children are less likely to be infected in the family than adults and are less likely to infect other family members, but children who attend school pose a risk to grandparents living with their grandchildren in the same home.
When formulating a strategy for the protection of people, it is necessary not only to reduce the total number of unnecessary contacts, but also to form separate groups of people, for example, in workplaces where there is no direct contact with other groups or shifts, departments , groups. It would also reduce the spread of the virus in society.
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