A British study published Friday, November 28 and conducted by researchers from Imperial College London, proves that contamination by Covid-19 is mainly done within the home. The study also provides first evidence concerning the transmission of the virus by asymptomatic cases which would be lower.
According to a study conducted by British researchers from Imperial College London, Covid-19 contaminations occur mainly within the home among all the transmission environments observed.
“After analyzing data from different environments including households, social gatherings with friends and family, travel, doctor’s visits, work and occasional close contacts (customers in a supermarket), the researchers found that households have the highest transmission rate with a rate of 21.1%, “Imperial College London concluded in a report released Friday, November 27. The rate of reproduction of the virus within the household, or the number of people that a patient infects, is 0.96. According to the researchers, it is nearly a quarter of the contaminations which take place within the home.
The study also proved that the chances of a member of one household infecting another are increased when the exposure time is longer than five days. The researchers nevertheless point out that the majority of the studies were conducted in China, “where strict controls have been implemented which could limit the relevance of the estimates.”
Less contagious asymptomatic cases
This study therefore raises questions as the holidays approach. “While many countries recommend isolation measures as the holiday season approaches and with sick people isolating themselves inside their homes, our results prove that this place is likely to continue to play an important role. in the transmission of the virus, ”says Hayley Thompson, author of the report.
However, the study does show that asymptomatic cases of infection are less contagious than cases with symptoms. “This analysis provides some of the first evidence that asymptomatic infections are substantially less infectious than symptomatic cases,” says Professor Neil Fergusson. According to the study, there is a 3.5% chance that an asymptomatic patient will “contaminate a close contact” against 12.8% for a symptomatic person.
UPDATE #COVID19 transmission
u27a1ufe0f3.5% chance of asymptomatic person vs 12.8% for symptomatic person to infect a close contact
u27a1ufe0fChance of one household member infecting another is significantly higher when exposure is 5+ days vs 5 or less days
— MRC Centre for Global Infectious Disease Analysis (@MRC_Outbreak) November 27, 2020