During the recent Covid-19 pandemic, the rate of serious illness and death was jarringly high in older populations. Why? Weakening immune systems — as we age, we become more vulnerable to infections, ...

Regulatory T cells (red) interact with other immune cells (blue) and modulate immune responses. National Institute of Allergy and Infectious Diseases/NIH via Flickr Every day, your immune system ...

Antibodies, which recognize viruses and proteins that the body has encountered before, have long gotten most of the credit for giving the human immune system a memory. Now, researchers at the ...

Your immune system may be weak if you have frequent, severe, or extended infections. Learn more signs of a weak immune system.

Your immune system is your body's frontline defense against infections, inflammation, and everyday stressors. While no single food or supplement can guarantee immunity from illness, a nutrient-rich ...

Your immune system is like an incredibly sophisticated security team, constantly patrolling your body for threats and neutralizing them before they can cause harm. When it’s working properly, this ...

The human body’s defensive lineup is impressive—from made-to-order antibodies to natural-born killers. Here’s how it wards off sickness in every season. When pathogens invade our bodies—in the form of ...

Your immune system could weigh 1 to 1.2 kilograms and contain 1.8 trillion cells. “The immune system is a complex system comprising many different cell types with essential functions,” says Ron Milo ...