Study found number of people testing positive for antibodies fell by 26% between June and September.
Says immunity appears to be fading and there is a risk of catching the virus multiple times.
More than 350,000 people took part in the test. bbc.in/35Be5fg
#COVID__19
Covid: Antibodies 'fall rapidly after infection' 🦠 "The fall was greater in those over 65, compared with younger age groups, and in those without symptoms compared with those with full-blown Covid-19."
#Covid19 study shows #NoHerdImmunity as protective antibodies 'fall rapidly after infection'
#REACT2 Study of 350,000 people by @ImperialMed:
“the number of people with antibodies fell by more than a quarter between summer and autumn.”