Typhus is a serious infectious disease caused by tiny bacteria called rickettsiae that spread through the bites of infected lice, fleas, or mites. When these insects bite someone, the bacteria enter the bloodstream and cause high fever, severe headaches, and a distinctive rash that often starts on the chest and spreads outward.

Throughout history, typhus killed millions of people, especially during wars, famines, and in crowded, unsanitary conditions where lice could spread easily from person to person. Soldiers living in trenches during World War I suffered terribly from typhus. The disease earned grim nicknames like “jail fever” because it swept through overcrowded prisons, and “camp fever” because it devastated military camps.

Typhus is different from typhoid fever, which is a separate disease spread through contaminated food and water. The similar names confuse people, but they're completely different illnesses with different causes.

Today, typhus is rare in places with good sanitation and hygiene, and doctors can treat it effectively with antibiotics. But it still appears in areas affected by war, natural disasters, or extreme poverty, anywhere people might be living in crowded conditions without access to clean clothes or regular bathing. The disease reminds us how closely public health is connected to basic cleanliness and living conditions.