You don't see or hear it happen, but it's strongly implied. 4 infected kids at a shelter are given koolaid with an overdose of potassium--it's a mercy killing. The group also abandons the infected little girl and her dad at this place.
It's a plague movie and the main group has a rule "if they're sick they're dead" and abandon anyone with symptoms (parents, each other, a child). One character describes burying the sick alive. A preacher on the radio describes the illness as a sort of punishment from God to "separate the wheat from the chaff" which one of the main characters buys into.
A man is killed for being Chinese, with an anti-Chinese slur used on a sign hung on his body. His body is purposefully displayed, and the racist sign indicates blame against Chinese people for bringing the virus. It is very upsetting. The main characters witness the murder and drive past his body after.
A group of men attempt to kidnap two pretty girls at gunpoint, they make them strip to check for disease. I’d say their motivations in doing this are quite clearly implied future assault.