Vaccines against Covid-19 may not need to be administered annually: WHO official

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MOSCOW: Any safe and effective vaccine against Covid-19 may not need to be administered annually, unlike vaccines for influenza, Dr. Richard Mihigo, the program area manager for immunization and vaccine development at the World Health Organization's (WHO) Regional Office for Africa, told Sputnik in an interview. "It's difficult to predict now for how long the effect of the vaccine will last. It's true that for flu vaccines, most of the time we need to repeat it...

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