Immunity in action with picture

Immunity in action. A healthy immune system can defeat invading pathogens as shown above, where two bacteria that cause gonorrhea are no match for the large phagocyte, called a neutrophil, that engulfs and kills them (see arrows).

Photos courtesy of Michael N. Starnbach, Ph.D., Harvard Medical School

Adopt healthy-living strategies

Info source:

http://www.health.harvard.edu/flu-resource-center/how-to-boost-your-immune-system.htm