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Dear Dr. Roach: I am a 77-year-old woman. I am current on all vaccines, but I do have a question about the pneumococcal vaccine. My physician recommends that I get one.

Dear Dr. Roach: Over the past year of pandemic lockdown, I have worked hard at reducing calories to lose weight and increasing my exercise on an elliptical trainer. I am 5 foot 7 and 70 years old. I went from 202 pounds to 149.3.

Dear Dr.

Dear Dr. Roach: I’m a teacher scheduled to get the Pfizer vaccine on Friday. My mom keeps sending me stuff about why I shouldn’t get it — fear of what it will do to the immune system in the future.

Dear Dr. Roach: I have had both COVID-19 vaccinations and am planning to donate blood. Would any of my immunity pass on to the person receiving my blood? D.J.

Dear Dr. Roach: A few years ago, my sister was diagnosed with an IgA deficiency, which is an autoimmune disorder. She was told by her doctor to avoid large crowds and to never shake hands with anyone.

Dear Dr. Roach: My wife and I are grateful to have recently received our second Moderna vaccine.

Dear Dr. Roach: I have seen several doctors for my TMJ: my primary doctor and dentist, an ear nose and throat doctor, the dental hygienist and also “ask Google.

Dear Dr. Roach: Many years ago, I was diagnosed with atrial fibrillation and then was on medication for 10+ years. I eventually had an ablation done, and I am finally back in normal rhythm. I have been off all meds for AFib for more than a year.

Dear Dr. Roach: Could you explain the science behind the new Johnson & Johnson COVID-19 vaccine? I hear it differs from the Pfizer/Moderna vaccines as it does not contain the mRNA and is only a single dose.