Dr. John Mellors is distinguished professor of medicine at the University of Pittsburgh and Chief of the Division of Infectious Diseases at UPMC in Pittsburgh, Pennsylvania.
19:28
If you have a compromised immune system, you can be fully vaccinated, but still not protected against COVID-19.
| Cookie | Duration | Description |
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| li_gc | 2 years | No description |
| loglevel | never | No description available. |
| msToken | 10 days | No description |