As respiratory illnesses – such as influenza, COVID-19 and RSV – have continued to increase in recent months, it seems as if our immune systems have received more attention than ever.

Your immune system may be momentarily suppressed by prolonged (more than 1.5 hours) strenuous exercise without food intake, which could provide an opportunity for an infection to take hold.

I f the COVID-19 pandemic has done one thing, it’s made us all more familiar with some of the important players in the immune system. Antibodies, B cells, and T cells are among the best known ...

Here’s how your immune system is fighting it. The human body’s defensive lineup is impressive—from made-to-order antibodies to natural-born killers.