The human body’s defensive lineup is impressive—from made-to-order antibodies to natural-born killers. Here’s how it wards off sickness in every season. When pathogens invade our bodies—in the form of ...

The bacteria Streptococcus pneumoniae (pneumococcus) causes serious infections such as pneumonia. Our lab has designed a new vaccine that is highly protective against this infection. We want to ...

Giorgia Guglielmi is a science journalist in Basel, Switzerland. The discovery is akin to a black-swan event — unexpected but making perfect sense once revealed, says Ruslan Medzhitov, an immunologist ...