[nucleardog]

When your immune system activity increases, generally so does your heart rate. It's fairly common to get sick and have an increased heart rate. A quick search for "heart rate when sick" will turn up a number of results explaining this, the mechanisms behind it, and more.

Sorry you missed out on simple, effective preventative health measures because of this misunderstanding.

[whatsupdog]

It lasted over 6 months. My resting heart rate has been 52 for over 2 decades. Months after the shot it was up to 75 and stayed there for over 6 months. Slowly crept back to 52.