When I was younger I got my yearly flu shot. I would get bed ridden sick every year, almost to the week, when the seasons started to change from fall to winter. For like 2 weeks. I also had a bad diet though (cereal, processed foods, fried foods). My last jab was probably around 17 y/o. I haven’t experienced being sick like that since. And since changing my diet in the last ~5 years to 90% red meat, I rarely get sick. If I do, it’s for like 2 days max.

It changes with my kids.