Updated Covid-19 boosters’ protection waned after two months, study says
NEW YORK – Covid-19 bivalent boosters’ protection against death and hospitalisation in elderly people began waning as soon as two months after vaccination, according to a preprint study.
The new report, written by researchers who looked at data from a Finnish patient registry, has not yet been peer-reviewed and was published as a preprint in the server MedRxiv. The study looked at hospitalisations and deaths among boosted and non-boosted adults, all of whom had completed the initial two-dose vaccine series. Nearly 1.2 million elderly patients and 444,683 chronically-ill individuals were included.
The omicron-targeted shots also did not reduce the risk of severe Covid-19 in chronically ill adults younger than 65, the study found. Only a small proportion of the group – 15 per cent – received an updated booster, which the authors said may have affected the results. In comparison, 52 per cent of the elderly group received an updated booster.
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