“The Black Death” usually invokes mental images of tolling church bells, doctors with beak-shaped masks, necrotic tissue, grave diggers, and the Middle Ages - but that’s far from the whole story. Meet Yersinia pestis: A Gram-negative, rod-shaped bacterium pictured here (in green) using scanning electron micrography on proventricular spines of a Xenopsylla cheopis flea (in purple). Yersinia pestis, which can infect most small mammals - cats, rats, dogs, and humans among them ...
Amazing Images: The Best Science Photos of the Week
If this fellow is in your well water, don't quench your thirst. This is a scanning electron microscope image of Giardia muris, a protozoan parasite that causes nasty diarrhea when it infects the intestines of its hosts.
Frozen in action, killer T cells appear remarkably alive as they attack a cancer cell. Several of the normally round T-cells acquire the elongated shape of active fighters as they subject their target to chemical attack, breaking down the cell membrane. . The Wars Within - Imgur
The "pork" tapeworm Taenia soliumis. Though intestinal infection is generally asymptomatic, T. solium larvae can cause cysticerosis in the brain, muscles and other body tissue. T. solium is a major cause of adult seizures in developing countries. Credit: Ron Boardman/Life Science Image/FLPA/ Science Source