WHO Does Not Recommend Mixing Vaccines PAHO’s Dr. Ropero explained that the third dose for the elderly and severely ill people is not to be confused with the booster shot, which is recommended for healthy people after their vaccines have become inactive over time. WHO also does not recommend mixing and matching different brands of vaccines because there are still studies being conducted on whether mixing different brands are safe. And while there have been over six billion people who have been v

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