Malaria is a serious disease caused by tiny parasites that enter a person's bloodstream through mosquito bites. When an infected mosquito bites you, these parasites travel to your liver and then attack your red blood cells, causing high fevers, violent shaking chills, and extreme exhaustion. Without treatment, malaria can be deadly.

For thousands of years, malaria killed more people than perhaps any other disease, shaping where civilizations could thrive and which armies could conquer new territories. Ancient Romans avoided certain swampy areas because of the mysterious fever that struck people there. The disease devastated armies, toppled empires, and slowed European colonization of Africa for centuries.

Today, scientists understand that specific species of mosquitoes spread malaria, and we have medicines that can cure it and drugs that can prevent it. Despite this progress, malaria still sickens hundreds of millions of people each year, mostly in tropical regions of Africa, Asia, and South America. Researchers continue working on better treatments and vaccines, while public health workers distribute mosquito nets and teach communities how to eliminate standing water where mosquitoes breed. The fight against malaria shows how understanding a disease's true cause transforms humanity's ability to combat it.