[1] Univ Santiago de Compostela, Dept Microbiol & Parasitol, Galicia 15782, Spain
[2] Univ Bucharest, Dept Microbiol & Immunol, Fac Biol, Bucharest 060101, Romania
[3] Univ Politehn Bucuresti, Fac Appl Chem & Mat Sci, Dept Sci & Engn Oxide Mat & Nanomat, Bucharest 060042, Romania
[4] Univ Georgia, Coll Vet Med, Dept Infect Dis, Athens, GA 30602 USA