A new strain of West Nile virus is spreading better and earlier across the United States, and may thrive in hot American summers, researchers said on Thursday.

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Scrapie can be transmitted to lambs through milk, according to new research published in BMC Veterinary Research. The study provides important information on the transmission of this prion-associated disease and the control of scrapie in affected flocks.

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Four transplant recipients in Chicago contracted HIV from a high-risk organ donor whose infection went undetected in what hospital officials say is the first documented case of the virus being transmitted by organ donation in the U.S. in more than 20 years.

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An estimated 50 million people caught diseases from animals such as dogs, cattle, chickens and mosquitoes between 2000 and 2005, according to a new study. Some 78,000 of them died.

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