Affiliation: | Lab. parasitology, Virology Serv., IRCCS S.Matteo, Pavia, Italy;Dept. Animal Biology, University, Pavia, Italy;Inst. Infectious Diseases, University-IRCCS S.Matteo, Pavia, Italy;Biology and Diagnostics Branch, Div.Parasitic Diseases, CDC, Atlanta, USA;Infectious Diseases Research Labs, (Lab.Parasitiology), University-IRCCS S.Matteo, Pavia Italy. |