The annoyingly stupid part is that for most fevers that don't approach the "You need to go to the ER right now" point it's actually best to simply let it run it's course and not try to "break" it with drugs since a fever is your body's own defense mechanism.
But these antivaxxers will do this stupid shit, then go "see it works" and then try to apply it to everything else
You are correct… kind of. It’s a weak defense because you can always use a decimal to get more precision, and thermometers are only so accurate in their measurements anyway.
You can do about as well with increments of 0.5 degrees Celsius as you can with whole degrees Fahrenheit, and most medical thermometers are only accurate within about 0.1° – 0.3° C anyway.
In Celsius, 40º+ deserves a hospital visit (35-36º is the usual body temp). If you somehow manage to get it to 100º, please take pictures, I'm pretty sure the body would glow
Yeah, pretty much anything in the triple digits is “call the pediatrician” levels when dealing with babies. Babies’ immune response is more focused on accepting immunizations from breast milk, and it will basically try to integrate things that have been filtered through mom first. The default response isn’t straight to “kill it” but rather “study it so we can protect against it later.” So babies’ immune systems really aren’t prepared for a full blown infection, because it won’t jump to actually fighting the infection until it is already pretty bad. If their temp is in the triple digits, it’s usually a sign that they caught something that didn’t already get filtered through mom’s immune system.