I'm pretty sure it is physical and mental development
Prolong feeling of sadness, loss of interests, angry outbursts, tiredness, sleep disturbances, anxiety, loss of appetite, slowed thinking, feeling of worthlessness, frequent/reoccurring of suicidal thoughts, unexplained physical problems and having a hard time thinking. [These are just a few symptoms]
It irritates your lungs and throat and it ca cause inflammation
It means that you are willing to put aside your own needs for someone else, and their happiness
A food handler should stop working until it has no more signs of infection. Or wear long gloves that go up their arms. I hope this is what you want.