LONDON: Protection from two doses of the Pfizer and AstraZeneca vaccines wanes within less than six months, according to a study of phone app data on Wednesday, suggesting that booster shots may be needed to ensure prolonged coverage.The latest finding comes as several countries are rolling out additional jabs for the fully vaccinated, a move slammed by the World Health Organization as millions in the world have yet to receive a single dose.
UK cases grew sharply after social restrictions lifted in July but hospitalizations have been stable for the last month.But Spector, a professor of genetic epidemiology at King's College London, warned that waning vaccine effectiveness among the most vulnerable could lead to more hospitalizations and deaths by winter.'In my opinion, a reasonable worst-case scenario could see protection below 50 percent for the elderly and healthcare workers by winter,' he said.
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