- Muc 1: phat sinh sau khi con vat nhidm mot luong nho cau trung Khi do se tao r; midn dich yeu va neu gay nhidm cho chung mot lieu cau trung cao hon (lieu sieu nhidm
5. CHAN DOAN B$NH CAU TRUNG LON
Dua vao tinh hinh dich te, trieu chung lam sang, xet nghiem mau phan Ion va m6 kham kiem tra benh tfch cho phep chung ta ch<in doan duoc benh c3u triing Ion.
- Vdi Ion con song:
Viec ch£n doan cd the can cu vao dich te hoc. Nhung dac diem dang chu y la: lura tuoi mac, mua vu, tinh trang ve sinh thu y. Trieu chung cua con vat cung la nhung da'u hieu het siic quan trong trong chan doan benh. Nhung bieu hien lam sang co the tha'y la: phan long, bo an, coi coc, long xu. Tuy nhien, neu chi dua vao trieu chung lam sang va dac diem dich te cua benh thi khd chan doan chfnh xac do la benh gi, vi cac benh ky sinh trimg thudng co bieu hien benh rat giong nhau. Vi vay, viec xet nghiem phan de chan doan benh la can cu: quyet dinh ke't qua chan doan doi vdi lgn bi benh cau trimg. Cac phuang phap thudng dugc diing la phuang phap Fullerbom, Darling, Cherbovich.. .. Cd the dung phuang phap dem Oocyst tren buong dem Mc.Master de xac dinh cudng dd nhiem cau triing d lgn.
- Vdi lgn da chet:
Viec chan doan dugc tien hanh qua md kham, kiem tra benh tfch ket hgp vdi viec diing phien kmh nao nhe niem mac ruot, soi kmh hien vi de tim Oocyst va cac dang khac trong qua trinh phat trien cua cau triing.
Theo Nguy!n Due Luu va cs (2004), khi chan doan benh cau triing. can chan doan phan biet vdi mot sd benh:
- Benh giun dua lgn: lgn benh cung co bieu hien tieu chay keo dai. coi coc. cham Ion, thinh thoang non, ho. Tdn thuang thav d gan, ruot, phoi, dac biet d ruot. Xac chet ga\
- Benh phan trang Ion con: Ion con ia phan long mau trang sua, dinh xun^ 5 !!!^ ^ m6n; Ion kem an, Idng xu, gay yeu, cham ldn. Ty le chet cao tir 40 - 70%, tham chi o.
- Benh ia chay do vi khuan ducmg rudt d Ion sau cai sua trd len. Ion bdnh co biSu hien kem an, dau bung, rdi loan tieu hoa, phan long, di xieu veo, coi coc. Benh tien trien
10-15 ngay thi chet neu khdng didu tri kjp thdi.
- Bdnh hdng ly: benh thudng mac nang d Ion cai sua va Ion 6 - 1 2 tudn tudi. Trieu chung dac trung cua benh la ia chay, phan mau hong chua mang nhay, mau va cac te bao hoai tu. Neu khdng chua tri kip thdi Ion se chet va chet vdi ty le cao.