mucus

"The solution can dilute the blocked nose, stimulate turnover of mucus and relieve inflammation."

In nature, dIgA is produced as part of the immune system and is released into tears, saliva and mucus as an early defense against pathogens.

These mutations lead to thick mucus buildup in the lungs, resulting in chronic infections and long-term lung damage.

She sees many children in her class who she thinks would probably be better off at home: “Kids with a lot of green and yellow mucus. We’ve had kids with active lice in school.”

That virus can transmit through an infected person’s saliva and mucus and likely spreads “when an infected person coughs, sneezes or touches a surface that is then touched by others,” the CDC said.