When was the last time you received a Covid vaccine? Because it might be time to get another one. The older vaccines are waning and new Covid variants are emerging.

To hear more, KCBS Radio's Holly Quan was joined on the KCBS Ring Central Newsline by Dr. Peter Chin-Hong, Professor of medicine and Infectious disease expert at UCSF School of Medicine.

 Mirela Gherban / Getty Images

When was the last time you received a Covid vaccine? Because it might be time to get another one. The older vaccines are waning and new Covid variants are emerging.
To hear more, KCBS Radio's Holly Quan was joined on the KCBS Ring Central Newsline by Dr. Peter Chin-Hong, Professor of medicine and Infectious disease expert at UCSF School of Medicine.
 Mirela Gherban / Getty Images

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