Prevalence of aac(6’)-Ie-aph(2″)-Ia resistance gene and its linkage to Tn5281 in Enterococcus faecalis and Enterococcus faecium isolates from Tabriz hospitals - Behnood, Amir; Farajnia, Safar; Moaddab, Seyed-Reza; Ahdi-Khosroshahi, Shiva; Katayounzadeh, Aliakbar (Iranian Journal of Microbiology)