ELI5: Explain Like I'm 5

Infectious invalidity

Infectious invalidity means that when someone is sick, they can't go to work or school because they might make other people sick too. This is like a rule that says if you have a cold, you need to stay home instead of playing with your friends, so you don't spread your germs to them.

The same rule applies to grown-ups at their workplaces. When someone has an infectious illness, they can't go to work and make their coworkers sick. This is important because some illnesses can spread easily and quickly from person to person, making a lot of people sick.

So, in summary, infectious invalidity is a rule that prevents sick people from going to work or school and spreading their illness to others. It's like staying home when you have a cold to protect your friends and family from getting sick too.