West Nile virus in Americas -- Hantavirus cardiopulmonary syndrome: a new twist to an established pathogen -- Human ehrlichioses and anaplasmosis -- Cross-species transmission of poxviruses -- The severe acute respiratory syndrome -- Newly identified human herpesviruses: HHV-6, HHV-7, adn HHV-8 -- Nipah and Hendra viruses encephalitis -- Enterovirus 71 encephalitis -- Avian influenza viruses and pandemic influenza