The company has literally laid people off sitting in the ICU bed, overworked them, and encouraged a hostile work environment for their benefit.
Why are you so preoccupied with what your coworkers do?
With kids going back to school and a variant that is immune to the vaccine in addition to people going back to the office and existed in shared spaces (bathroom, break room, fridge, cubicles, etc.) it is not at all shocking that people would actually call out for being sick.
I swear the worst part of working for Centene is having coworkers just like you. Looking for your coworkers flaws instead of addressing why you have so much time and energy to manage what they do with THEIR time.