New study claims that efficacy of single dose of Covishield falls after 16 weeks for individuals aged above 60 years
The vaccine is produced by Oxford University and British-Swedish pharmaceutical company AstraZeneca plc.
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Pak PM Imran Khan tests COVID-19 positive just two days after taking Chinese vaccine ‘Sinopharm’
Pakistan Prime Minister Imran Khan has tested positive for coronavirus, just two days after taking the first shot of Chinese COVID-19 vaccine Sinopharm.