The immune system is a system of many biological structures and processes within an organism that protects against disease. To function properly, an immune system must detect a wide variety of agents, known as pathogens, from viruses to parasitic worms, and distinguish them from the organism’s own healthy tissue.  If a person has an infection, immune cells are activated to protect them against getting the … Continue reading In world’s first, immune cells imaged responding to infection at the same time.