There’s a little bit of good news for backyard barbecuers this summer — that frightening new virus called chikungunya is not likely to get you. But West Nile virus just might. Chikungunya has been making headlines because it’s spread rapidly across the Caribbean and Central America in just half a year, infecting 260,000 people and killing 21. But a recent study suggests the United States has a bit of time on its side. The strain of chikungunya circulating in the Caribbean is the Asian strain, and it’s only adapted to be carried by the Aedes aegypti mosquito, says Scott Weaver of UTMB, who’s been studying the virus for years. And so far, that mosquito can only be found in the far southern U.S.