It's bad to intentionally spread a contagious disease.
David has been assigned lots of work by his manager, but he has caught the flu recently.
David wants to react to the pressure from work.
David calls the day off until he is fully recovered.
David goes to work to finish his work despite his sickness.
His coworker thanks David for being considerate and agrees to share some of his workload.
His coworker sitting next to him develops a cough on the following day and blames David for infecting her.