Perspective | I'm a 64-year-old vaxxed doctor. Here's how I calculate … – The Washington Post

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In the past few weeks, the tide of government coronavirus mandates has clearly turned. Pretty soon, nobody will be forced to wear a mask in most indoor spaces. But that only shifts the decision onto the individual, so the question remains: Should you wear one?
If you’re wondering how to calculate risk in the post-mandate world, you may find it useful to see how I — a moderately cautious (and, I hope, relatively nondogmatic) academic physician who has written and spoken extensively about covid — concluded that jettisoning the mask last week at a friend’s 65th birthday party was safe or, at least, safe enough. You may not have as many statistics at the ready as I did, but many Americans may soon be doing some version of calculations like these several times a day.
Before I tell you about this one decision, here’s some context: I live in San Francisco — a blue city in a blue state, and one that’s been aggressive when it comes to coronavirus precautions. I’m 64 — old enough to be at moderately high risk from the coronavirus. I’ve had three Pfizer shots and, to my knowledge, have never had covid.
Having made it this far without getting covid-19, I think it would be a dumb time for me to catch the virus. Case rates are falling fast enough that the risk will soon be sufficiently low for me to let down my guard. When? There’s no bright line separating safe from unsafe, but case rates of approximately 10 per 100,000 people per day and test positivity rates of less than 1 or 2 percent would make it quite unlikely that a person in line with me in the supermarket or sitting near me at a restaurant has covid. (No state has case rates quite that low, but Maryland is closest, at 11 cases per 100,000; its test-positivity rate is 2.3 percent.) When rates reach that level, I’ll begin eating indoors and will remove my mask in low-risk indoor settings. But I’ll still mask up in very crowded indoor spaces.
Why do I still fear a case of covid? First, after three shots, my chances of severe illness are low, but they’re not zero. Second, I worry about long covid — study results vary, but a reasonable interpretation is that about 5 percent of people who become infected after vaccination can expect symptoms that last longer than a month. And a recent study found a disconcerting rise in cardiovascular diagnoses, including heart attacks and strokes, in people previously infected with the coronavirus. Finally, while I don’t have much contact with young children, I do with immunosuppressed people and the elderly, and I don’t want to infect someone if I can avoid it.
Mask mandates are falling prematurely. We can still keep people safe.
When I was invited to my friend’s birthday party near Miami, though, I had little hesitation about saying yes: Many of my college pals would be there, and I’d get to stay with my recently widowed 86-year-old mother, who lives nearby. The host asked his guests to be vaccinated and boosted and to take a rapid test immediately beforehand. My assumption was that most did, raising the level of safety.
Case rates in Florida and in the hometowns of the guests were well above my maskless threshold (they averaged 30-80 cases per 100,000 residents per day), so I was not ready to eat and drink indoors there. Thankfully, the plan was that eating, drinking and socializing could be outside or in. That sounded great: I’d mask to pick up my food and drink inside, then make a beeline to the backyard.
Good plan, until nature intervened. Just as I pulled up to my friend’s house, it began to pour. I had three choices: leave the party; eat and drink outside — drenched, alone and pitiful; or ditch the mask and enjoy the party indoors.
Here was my quick calculation of the risks I’d be taking if I chose to join my friends inside. (Most of these odds are based on rigorous studies or official data, but some involved educated guesswork and extrapolation. But even if I was off by a significant amount in some estimates, it wouldn’t matter much for the crux of the decision.)
To estimate probabilities for those other bad outcomes, beyond the 1-in-50 chance of getting infected, I multiplied fractions:
In the practice of medicine, our lifeblood is calculating and applying benefits and risks. Those were the risks. The benefits were enjoying a party with close friends, many of whom I hadn’t seen for years. Before walking in, I asked myself how I’d feel if any of these bad things happened. The answer was “terrible,” of course, but, given the low odds, I wouldn’t feel that I’d made the wrong decision. And so I entered, removing my mask after the first few minutes.
People who have had covid-19 don’t need three vaccine shots
I tell you this whole soggy dog story not because it’s unusual, but because it’s not: It’s the kind of scenario that tens of millions of people have been grappling with since March 2020. The difference is that now, as the rules are stripped away, the decisions become entirely personal.
It’s understandable why, faced with this much math and angst, many folks have decided that going maskless everywhere is less stressful and safe enough. I wouldn’t argue with fully vaccinated people who choose to discard their masks in indoor settings. Odds are they’ll do fine. As for me, I loved the party, kept the virus at bay — though one attendee got covid a few days later, possibly from the gathering — and felt good about my decision. The next day I went back to wearing masks indoors and avoiding indoor dining — a decision I feel equally good about, and one that I’ll rethink if and when cases fall some more.

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