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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.

Dear Dr. Roach: I am a 76-year-old woman in reasonably good health. Around Thanksgiving last year, my left ankle was swollen, red and very painful. I thought it was tendonitis, so I stopped going for my half-hour walks in the morning.

Dear Dr. Roach: I have liver disease (my doctor calls it mild cirrhosis) and terrible, painful varicose veins. Is it safe for me to get a vein stripping? V.P.

Dear Dr. Roach: I am a 77-year-old woman with spinal stenosis and have been treated by a pain-management doctor for several years. My pain is from my neck down to my lower back and radiates to my legs.