Countries are mixing and matching vaccines to tackle the delta variant

Amid concerns over the efficacy of the Sinovac and Sinopharm vaccines, many countries are starting to use other vaccines as booster shots

Landwebs Landwebs
Aug 6, 2021 - 07:00
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Countries are mixing and matching vaccines to tackle the delta variant
Amid concerns over the efficacy of the Sinovac and Sinopharm vaccines, many countries are starting to use other vaccines as booster shots
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