The first time I got a Novavax Covid vaccine, it felt almost subversive.

Over the previous few years, every mRNA-based booster I’d gotten — the ones made by Moderna and Pfizer — had felt like a two-day bout of the flu. I’d gamely booked sick days into my calendar and sucked it up through fevers, headaches, and exhaustion, comforting myself with ibuprofen and the knowledge that at least I was keeping my elderly parents safe.

Two and a half years into the pandemic, the Food and Drug Administration approved a Covid vaccine made by biotech company Novavax using older vaccine production technology. Licensed for people 12 and over, it was nearly as effective at Covid prevention as Pfizer and Moderna’s mRNA vaccines — and, as I noted with great interest, it had fewer side effects. In 2023, I got one.