I am training for a half marathon and am experiencing chafing from my sports bra on my sternum area. I have tried using Vaseline, band aids, etc. to prevent it, but nothing seems to work. Any suggestions?

I have noticed that I often come down with a bug after a weekend of drinking. I don't drink often, but when I do on special occasions, I often (almost always) end up sick with swollen lymph nodes, strep throat, cold symptoms, etc. Recently, I also had mono and then the flu after special weekends where I drank more than just 1 or 2 drinks. My other family members and friends do not experience this and I am not getting less sleep than them or going any harder than others. What could be the reason for this and what blood work should I be asking for to rule things out?

I'm HIV positive, very low viral load & great t-cell count (not on meds). I've been reading recently that flu shots aren't all they're cracked up to be. What are the dangers of a flu shot, and if my immune system is already doing well, should I still get a flu shot?

I've been hearing a lot on the news about the new virus [novel coronavirus, COVID-19] and I'm seeing students on campus wearing masks. The news seems to have conflicting information and I'm not sure what to do. Should I be worried? Do I need to wear a mask too? Thank you.

When is a person with a cold contagious? A couple of friends, who are put off when I keep my distance from their sneezing and coughing, insist one is only contagious a week or so before symptoms appear. In the back of my memory is the idea that one remains contagious until a few days *after* primary symptoms disappear. I'm not usually so concerned about this, but I'm coping with a couple of other annoying health problems and want to try to avoid adding a cold or flu, to boot. I do the usual things news shows recommend — eat well, wash hands frequently. But when should one avoid others who have colds, or when should one stay isolated at home when one has a cold (or flu)?