I am thankful for antibiotics. This one also probably could've gone in the "something you take for granted" category - that it is exceedingly unlikely that I will die this year from any kind of infection that responds to antibiotics. I don't have to worry that much about cuts, bites, or even most bacterial infections. I didn't have to worry that much about post-surgical infections for Josh (and he had many, with metal devices coming of his head right as he was at the handsy stage of late baby / young toddlerhood). All these things were potential killers even for young and healthy people before the discovery of antibiotics. I'm grateful for the way this increased lifespan and decreased suffering. I understand that antibiotic resistance is becoming a problem, and I am grateful that there are smart people working on this problem.
I'm grateful for people who devote their lives to science and medicine, who are right now working towards finding the next big medical breakthrough that will alleviate or eradicate diseases that are plaguing people now.