When a pathogen, such as the flu, enters the body, an immune cell with the barcode for flu recognizes it and mounts a response, getting the body to make more immune cells like it to help fight the virus. (discovermagazine.com)
White blood cells vomit forth inflammatory molecules called cytokines, attracting more immune cells like riot police to a prison break. (discovermagazine.com)
These chemicals, called cytokines, drive the inflammation in the brain, attracting more immune cells, and causing the debilitating disease marked by loss of neurological function. (sciencedaily.com)