The plague caused by bacteria and transmitted through the bites of fleas and infected animals can develop in three different forms. Bubonic plague causes swollen lymph nodes, while septic plague infects the blood and pneumonic plague infects the lungs.
Pneumonia – the kind that Chinese patients have – is more virulent and harmful. If left untreated, it is always fatal, according to the World Health Organization (WHO).
Outbreaks of plague ravaged Europe in the Middle Ages, killing some 50 million people. Since then, we have invented antibiotics that can cure most infections if caught early enough ̵