You shouldn't have to spread sickness to people around you.
Al was at work, but he hadn't been feeling very well.
Al wants to finish the project he was working on.
Al leaves and goes home to complete the work remotely while he healed.
Al stays at work in order to finish the project he was working on.
Al is able to finish the work on the project without getting anyone else sick.
Al gets other people on his team sick with the illness that he had.