Sat, January 24, 2026 at 2:56 PM UTC The immune system is the body’s natural defense network that helps to keep you healthy from things like bacteria, viruses, and parasites. It’s a complex network of ...

Disease can arise both when immune cells are too active and when they're not active enough. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. For ...

Your immune system is your body’s built-in defense network, working nonstop to protect you from bacteria, viruses, and other harmful invaders. Your immune system includes two main parts: the innate ...