The debilitating outbreak sweeping the Americas
Willie Grace | 12/17/2014, 11 p.m. | Updated on 12/17/2014, 11 p.m.
(CNN) -- Its name means "bending over in pain." It has no treatment or vaccine. Its symptoms resemble Dengue fever. And it has infected more than 1 million people -- 155 of them fatally -- since spreading to the Americas one year ago.
The mosquito-borne Chikungunya virus has long been diagnosed in travelers returning from countries in Asia and Africa, where the disease is widespread. But in December 2013, the first people infected by mosquitoes local to the region were reported on the Caribbean island of Saint Martin.
This was the first outbreak of the debilitating disease in the Western Hemisphere, health officials said.
All countries in Central America have now reported local transmission of Chikungunya [pronounced chik-un-GOON-ya], and the United States had 11 confirmed cases of local infection this year as of December 12, all in Florida. There also have been 1,900 imported cases across the United States in returning travelers.
"It wasn't until 2013 that unfortunately a traveler resulted in local transmission of Chikungunya," said Erin Staples of the U.S. Centers for Disease Control and Prevention (CDC), referring to the people infected in Saint Martin.
Those infected carry the virus in their bloodstream; it can then be picked up by mosquitoes as they bite, making them carriers. The virus has since spread rapidly and shows no signs of leaving, as ecological conditions are perfect for the disease to flourish.
"We knew it would spread," said Staples, a medical epidemiologist.
The big question perplexing officials: Why now?
Two mosquito species primed to the temperatures of Central and South America carry Chikungunya. The species -- Aedes aegypti and Aedes albopictus -- also carry the virus behind Dengue fever.
"Given the level of Dengue in the region, we knew there could be the same levels of Chikungunya," Staples said. Both diseases can cause joint pain and inflammation, headaches, rashes and fever, and can lead to death in rare cases.
But this tropical disease with an exotic name (which originates from the African Makonde dialect) causes more intense joint pain and inflammation. For some people the pain can last for months or years, resulting in additional psychological strain.
The lack of immunity among people living in the Americas provided a blank canvas for Chikungunya to spread throughout the population this year. As of December 12, more than 1.03 million people have been infected, in addition to the 155 who died, according to the Pan-American Health Organization (PAHO). Almost all of the fatalities occurred in the Caribbean island countries of Guadeloupe and Martinique.
"Where we saw the biggest jump was after it reached the Spanish-speaking countries in the region," said Staples, referring to the weakened infrastructures and health systems of countries such as the Dominican Republic, which has reported more than 520,000 cases -- more than half of the overall outbreak and 5% of the island country's population.
As South American countries approach their summer, numbers are expected to rise there as the mosquitoes flourish in the heat.
"Brazil, Peru, Paraguay are coming into their summer months and reporting their first local transmission," Staples said. Already, more than 2,000 people have been infected in Brazil.