[1] Univ Nacl La Plata, Catedra Microbiol & Parasitol, Fac Ciencias Med, RA-1900 La Plata, Buenos Aires, Argentina
[2] Consejo Nacl Invest Cient & Tecn, RA-1033 Buenos Aires, DF, Argentina
[3] Comis Invest Cient Prov Buenos Aires, La Plata, Buenos Aires, Argentina
[4] Univ Nacl Ctr Prov Buenos Aires, Fac Ciencias Vet, Buenos Aires, DF, Argentina
[5] ARS, Environm Microbial & Food Safety Lab, USDA, Beltsville, MD 20705 USA