Health Day reporter
FRIDAY, June 4, 2021 (HealthDay News) – Among the good news for those who have already suffered from a COVID-19 crisis, a new study finds that they could have a much lower risk of reinfection for at least 10 months.
For the study, researchers analyzed rates of SARS-CoV-2 infections between October 2020 and February 2021 among more than 2,000 nursing home residents (median age 86) and staff. Antibody tests were used to determine if they had had a previous infection up to 10 months earlier.
Residents with a previous infection were 85% less likely to be infected during the four-month study period than those who had never been infected, while staff with previous infections were 60% less likely to ‘get infected than staff who had never been infected, the results showed.
Of the 634 people who had been previously infected, re-infections occurred in four residents and 10 staff, compared to 93 residents and 111 staff among the 1,477 who had never been infected, according to the study published on 3 June in Lancet Healthy Longevity newspaper.
The study excluded the impact of vaccination by removing participants from the analysis 12 days after their first dose of vaccine. The authors examine the effectiveness of the vaccine in a separate study.
“It is very good news that natural infection protects against re-infection during this time. The risk of getting infected twice appears to be very low,” said lead author Maria Krutikov of the Institute of Health. Informatics of University College London (UCL), in United Kingdom.
“The fact that a previous COVID-19 infection offers a high level of protection to nursing home residents is also reassuring, given past concerns that these people may have less robust immune responses associated with age.” Krutikov said in an academic press release.
“These findings are particularly important because this vulnerable group has not been the subject of much research,” she added.
According to lead author of the study, Laura Shallcross, of the Institute of Health Informatics at UCL, “It was a unique opportunity to examine the protective effect of natural infection in this cohort prior to deployment. vaccination. An important next step is to study the duration of immunity after natural infection and vaccination, and to assess whether this protective effect is maintained against current and emerging variants. “
The US Centers for Disease Control and Prevention has more on COVID-19 re-infection.
SOURCE: University College London, press release, June 3, 2021
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