The Bubonic Plague Still Kills Thousands Of People Every Year
The first case was reported in August. As of November 19, there have been 119 cases and 40 deaths.
The plague is spread among rodent populations by fleas, who can also infect humans. Symptoms include fever, chills, weakness, and swollen, painful lymph nodes. Usually, a bite from an infected flea leads to the bubonic plague, which can be treated with antibiotics. But if the bacteria enters the lungs, it can turns into pneumonic plague, a far deadlier version that can cause respiratory failure and spread person-to-person by coughing. Two percent of cases in the Madagascar outbreak have been pneumonic.
"The mortality rate depends on how soon treatment is started," the WHO notes, "but is always very high."
Of particular concern in the current outbreak is Antananarivo, Madagascar's capital and largest city, where two cases and one death have been reported already. "There is now a risk of a rapid spread of the disease due to the city's high population density and the weakness of the healthcare system," the WHO warned in a press release, adding that the local flea population has developed a high resistance to deltamethrin, a popular insecticide.
Each year, the World Health Organization receives reports of 1,000 to 2,000 cases, a number that may underrepresent the true number of infections. "Plague epidemics have occurred in Africa, Asia, and South America," the Centers for Disease Control and Prevention notes, "but most human cases since the 1990s have occurred in Africa."
Madagascar's rat-infested jails have contributed to plague outbreaks there before. "An average of 500 cases have been recorded on the island every year since 2009," The Guardian reported last year.
Plague In The US
Over the summer, the news that a Colorado man was diagnosed with the plague may have left some wondering: Does that still happen here?
The answer, somewhat surprisingly, is yes.
While the last plague epidemic in the United States was back in 1924, when 37 people died in Los Angeles, the much-feared disease still surfaces in Americans from time to time, though it's very infrequent - and fully treatable with antibiotics if it's caught in time.
"Plague... spread from urban rats to rural rodent species, and became entrenched in many areas of the western United States," the CDC explains. "Since that time, plague has occurred as scattered cases in rural areas."
Between 1900 and 2010, there were 999 "confirmed or probable" cases in the U.S. More than 80% of those were bubonic, where the bacteria infects the lymph nodes. (The Colorado man had the deadlier version: pneumonic plague.)
Here's a look at how many people in the US have had the plague each year since 1970 (2012 is the most recent year shown):
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