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Posted inDr. Roach

Where do COVID variants come from?

DEAR DR. ROACH: We know COVID-19 came from Wuhan, China. Where are the delta and other variants coming from? — D.B. ANSWER: COVID-19 was first described in Wuhan, China, although the exact mechanism of how the virus that causes COVID-19 (called SARS-CoV-2) came to infect humans is not known. Most authorities believe it evolved from […]

Posted inDr. Roach

Post-COVID natural immunity has its limits

DEAR DR. ROACH: How does one manage natural immunity to COVID-19 if one has an autoimmune disease? Does that person take vitamin D3, zinc, etc.? — J.K.S. ANSWER: “Natural immunity” refers to the protection that is conferred after a natural infection, as opposed to vaccination. Studies have shown that protection from infection following a case […]