The SIREN examine from Public Health England’s (PHE) was carried out amongst roughly 20,000 well being care professionals and it discovered that solely 44 members of 6,614 who had COVID-19 antibodies upon recruitment skilled “potential” reinfection — representing an 83% much less likelihood of an infection in comparison with these with out antibodies. The examine was carried out between June 18 and Nov. 24.
Antibody an infection lasted for about 5 months, on common, from when members have been first contaminated, SIREN discovered.
“We now know that the majority of those that have had the virus, and developed antibodies, are protected from reinfection, however this isn’t whole and we don’t but know the way lengthy safety lasts. Crucially, we consider individuals should have the ability to move the virus on,” SIREN examine lead and PHE Senior Medical Advisor Susan Hopkins mentioned in a Wednesday assertion.
Only two members skilled “possible” reinfections among the many 6,614 members with COVID-19 antibodies, representing a less-than 1% “possible” repeat an infection, SIREN discovered. Cases have been recognized as “potential” or “possible” based mostly on “the quantity of confirmatory proof accessible.”
Hopkins added that individuals who have already contracted COVID-19 can “be reassured it’s extremely unlikely” they are going to “develop extreme infections,” however reinfections can nonetheless transmit the virus to others.
Only about 30% of members with antibodies who have been reinfected reported signs in comparison with about 78% of those that have been contaminated with the virus for the primary time, Hopkins defined throughout a press launch, in response to Nature.com.
Still, these outcomes won’t ring true for each individual contaminated with COVID-19. One examine revealed in August, for instance, exhibits an instance of a Nevada man who skilled extreme COVID-19 signs after being reinfected with the virus.
Nevada researchers discovered that an individual’s preliminary publicity to COVID-19 “might not lead to a stage of immunity that’s 100% protecting for all people.” Researchers additionally famous within the introduction that with different types of coronavirus, immunity may be misplaced inside one to a few years.
“Now greater than ever it’s critical all of us keep at residence to guard our well being service and save lives,” Hopkins mentioned in her Wednesday assertion.
SIREN researchers will proceed to check members over the course of the subsequent yr to see how lengthy COVID-19 immunity lasts amongst individuals who have beforehand been contaminated with the virus.