A family-based study in Tennessee and Wisconsin found that coronavirus spreads in households much faster than previously thought – 51% of individuals living with an infected person are self-infected.
Similar research from the US, Europe and Asia reported that number was 30%, or less.
Preliminary research also shows that cases can originate in both children and adults, with at least 75% of secondary infections occurring within five days of the first person in the home showing symptoms. .
Researchers say immediate isolation and wearing a mask should happen as soon as someone in your home gets sick, especially as winter approaches and people begin to spend more time in the house. in the home.
Researchers at Vanderbilt University said: “In the absence of an effective approach to identifying infections without taking into account symptoms, these findings suggest that the application of Quarantine as soon as a person feels sick can reduce the probability of transmission in the family ”. liberate, release, free.
What the researchers consider an important finding is that less than half of the family members included in the study have symptoms when tested positive for the first time, while many others still don̵7;t. symptoms during 7 days of follow-up.
A total of 101 homes – including 101 nominated patients and 191 household members – from Nashville, Tennessee and Marshfield, Wisconsin were included in the study. Fourteen people under the age of 18, including 5 under 12 years old. The average age is 32 years old.
The 70 index patients – the first to get sick in the home – reported sharing a room for more than 4 hours with one or more family members the day before becoming sick with COVID-19, while 40 others spent so much. time with others on the day after a positive test. Some also reported sharing a room with family members for the days before and after their diagnosis.
Researchers found that 36% of infections originate from people with symptoms and 18% from asymptomatic family members.
The study was published in a weekly report by the Centers for Disease Control and Prevention.