A crop duster sprayed about 8,000 acres of mosquito-infested land
 around Orlando's theme parks and tourist attractions yesterday in
 Florida's fight to stem an outbreak of deadly mosquito-borne
 encephalitis.
     So far, no humans have tested positive for the disease. But the
 virus has turned up in animals used to determine whether local
 populations of mosquitoes are carriers. Eight Florida counties have
 reported finding the virus, and the outbreak in the heart of one of
 the world's busiest vacation destinations worries the $38-billion-a-
 year tourist industry.
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