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The female mosquito needs your blood to grow her eggs. Please don’t feel singled out. She bites everyone. There is no truth to the myths that mosquitoes prefer women over men or blondes and redheads over those with darker hair. She does, however, play favorites. Type O blood seems to be the vintage of choice. Stinky feet emit a bacterium that woos famished females, as do perfumes. As a parting gift, she leaves behind an itchy bump (an allergic reaction to her saliva) and potentially something far worse: infection with one of several deadly diseases, including malaria, Zika, West Nile, dengue and yellow fever.
Mosquitoes are our apex predator, the deadliest hunter of human beings on the planet. A swarming army of 100 trillion or more mosquitoes patrol nearly every inch of the globe, killing about 700,000 people annually. Researchers suggest that mosquitoes may have killed nearly half of the 108 billion humans who have ever lived across our relatively brief 300,000 years of existence.
Malarious mosquitoes patrolling the Pontine Marshes facilitated both the rise and the fall of the Roman Empire. Initially shielding the Eternal City from the Visigoths, Huns and Vandals, they eventually pointed their proboscises inward on Rome itself. Mosquitoes also played a role in steering slave ships from Africa across the Atlantic, because plantation owners in the Americas believed that Africans withstood the onslaught of mosquito-borne disease better than indigenous slaves or European indentured servants. Malaria, a parasitic disease, is the unsurpassed scourge of humankind. Dr. W. D. Tigertt, an early malariologist at Walter Reed Army Medical Center, said, “Malaria, like the weather, seems to have always been with the human race.” He continued, “And as Mark Twain said about the weather, it seems that very little is done about it.” Even today, more than 200 million unlucky people contract malaria each year.
Mosquitoes also transmit a catalog of viruses: dengue, West Nile, Zika and various encephalitides. While debilitating, these diseases are generally not prolific killers. Yellow fever, however, is the viral exception. It can produce fever-induced delirium, liver damage bleeding from the mouth, nose and eyes, and coma. Internal corrosion induces vomit of blood, the color of coffee grounds, giving rise to the Spanish name for yellow fever, vómito negro (black vomit), which is sometimes followed by death.
Today, roughly four billion people are at risk from mosquito-borne diseases. As our ancestors can attest, our battle with the mosquito has always been a matter of life and death, and it’s beginning to look as though this confrontation is coming to a head.
