Immune system with power

Medical Cells Immune System

Macrophages (shown in white in the illustration) circulate throughout the body with the blood. If they encounter a pathogen (green), they grab it with their long arms (pseudopodia), enclose and decompose it.
© Illustration: Science Photo Library/David Marchal

Bacteria and viruses attack us every day. But usually we don't notice anything because our immune system is able to fend off the attackers with accuracy. by Gerlinde Felix

When the smallpox epidemic was rampant in England in the 18th century, doctor Edward Jenner observed that maids who worked with cows were spared the disease. He wondered if the maids might have been exposed to cowpox before. Could an infection with the cowpox pathogen protect against a later smallpox disease that is dangerous for humans? Jenner dared an experiment. He cut the arm of an eight-year-old boy and dripped pus from a cowpox blister onto the wound. The boy got

Read more with bdw+

now Try 1 month FREE and access
on all articles of the magazine
image of science received!

secure offer

Are you already a bdw+ subscriber? Sign up here"

Are you already a subscriber to the bdw print magazine? Upgrade here»

Recent Articles

Related Stories