Infection glitch

Ive recently seen an Infection glitch where you can kill your teammates. It was on Kampys twitch ( username kampyvids) where at 3 hours and 20 minutes in, he discovered this problem. The date this stream occured is March 2nd. Keep in mind Kampy had not modded his game or console.
Please fix this issue before the update on March 9th. Thank you for reading. Have a nice day.