A painful and debilitating mosquito-born virus has been transmitted in the US for the first known time, with two cases in Florida, say health officials.
Those infected were a 41-year-old woman near Miami who began experiencing symptoms on June 10, and a 50-year-old man near Palm Beach, who first noticed the illness on July 1.
Both of them - neither of whom had travelled out of the country before being infected - were said to be doing well.
A health worker checks a child for the virus in El Salvador All prior reported cases involved recent travellers to the Caribbean, where the virus is raging.
"The arrival of chikungunya virus, first in the tropical Americas and now in the United States, underscores the risks posed by this and other exotic pathogens," said Roger Nasci of the Centers for Disease Control and Prevention (CDC), in a prepared statement.
Chikungunya virus is incurable and can be fatal. Infected people usually suffer fever, severe joint pain and swelling, muscle aches, headaches or rash.
A Haitian health worker sprays chemicals to kill mosquitoes Patients usually recover in about a week, though some people suffer long-term joint pain.
There were more than 230 chikungunya US cases reported this year, but all the others were travellers thought to have been infected elsewhere.
The virus is transmitted from an infected person only if they are bitten in the first weeks of illness by an uninfected mosquito, said state epidemiologists.
CDC officials think chikungunya will behave like dengue virus, with imported cases resulting in sporadic local transmission but not widespread outbreaks.
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