Benh viem ph~ quan truyen nhiem (VPQTN) tren ga la benh nguy hiem gay thiet hai kinh t~ cao cho nha chan nuoi, B~c bier nghien ciru v~ vi rut gay benh VPQTN tren ga a khu vue B6ng bang song Ciru Long con r~t han ch~. Do do nghien ciru d~c diSm gen cua vi rut gay benh VPQTN duoc ti~n hanh nham ch~n dean va xac dinh SlJ hru hanh cua cac chung vi rut VPQTN phan l~p duoc tai cac huyen Vilng Liern, Long H6 thuoc tinh Vinh Long va huyen Long Phu, My Tu thuoc tinh See Trang. K~t qua nghien ciru cho th~y ky thuat RT-PCR sir dung cap m6i duoc thi~t k~ dira tren gen N phat hien duoc 02 trong s6 10 m~u (20%) a cac trai ga thuoc tinh Vinh Long va 06 trong s6 10 m~u (60%) tai tinh See Trang duong tinh vci vi rut VPQTN. VPQTN gay thi~t hai dang k~ voi ty l~ ga chet l3,12% trong t6ng dan, K~t qua phan tich gen N cua vi rut phan l~p diroc voi cac chung tham chieu cho th~y gen N dt it bien d6i. Ngoai ra qua phan tich cay pha h~ va so sanh dQ nrong d6ng v~ nucleotic va amino acid cho th~y cac chung phan I~p duoc tai tinh Vinh Long va Soc Trang duoc chia thanh 3 nhom: horn 1 g6m VPQTN-STl, VPQTN-ST2, VPQTN-ST5 co dQnrong d6ng cao voi chung 4/91 (Genotype 793/B) khoang 99 - 100%; Nhom 2 gorn VPQTN-ST3, VPQTN-ST4 nrong d6ng 99 - 100% voi chung Mass 41 (Genotype Massachusetts); Nhorn 3 g6m VPQTN-ST6, VPQTN-VLl, VPQTN-VL2 nrong d6ng 93 - 100% v~ nucleotic va 95 - 100% v~ amino acid voi chung LX4 (Genotype QX). Tom lai k~t qua nghien ciru cho th~y ch~n doan benh VPQTN bang ky thuat RT-PCR dua tren gen N cho k~t qua t6t va co SlJ hru hanh cac chung vi rut VPQTN genotype Massachusetts, 793/B va QX tai tinh Soc Trang va a Vinh Long chi co SlJ hru hanh cac chung thuoc genotype QX. TU khoa: Gen N, RT-PCR, VPQTN, Vlnh Long va Sac Trang