Home / Top World News- News18.com / China's CanSinoBIO Says Covid-19 Vaccine Shot May Be Less Effective Over Time, Booster Shot Promising

China's CanSinoBIO Says Covid-19 Vaccine Shot May Be Less Effective Over Time, Booster Shot Promising

2:07 PM Top World News- News18.com

The vaccine has been approved in China, Pakistan, Hungary and Mexico.

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