00:00West Nile virus is showing up earlier than normal, and it's already spreading.
00:05California health officials have confirmed infected mosquitoes in six counties.
00:09That is well ahead of the typical season.
00:11Here's the problem.
00:13There's no vaccine for West Nile virus, and there is no approved treatment.
00:18Prevention is the only defense doctors have.
00:21The CDC is urging people in affected areas to use EPA-registered repellents.
00:26Officials also recommend covering up during dusk and dawn.
00:30That is when mosquitoes are often most active.
00:33Residents are also being told to dump standing water around their homes immediately.
00:37Health officials say the early detection could be a warning sign.
00:41Warmer spring temperatures may be giving mosquitoes a longer window to spread disease this year.
00:46Now other states are watching closely.
00:48They want to see if the same early pattern appears where they live.
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