Cau 1:Trinh bay cac loai hinh the cua vk,neu y nghia cua chung trong chan doan vi sinh

VK la nhung sinh vat don bao, k co mang nhan.chung co cau truc va hoat dong don gian hon nhieu so voi cac te bao co mang nhan.

Ve hinh the nguoi ta chia vk lam 3 loai lon:

-Cac cau khuan:la nhung vk co hinh cau,mat cat cua chung co the la nhung hinh tron,nhung cung co the la hinh bau duc or ngon nen. duong kinh trung binh khoang 1µm.cau khuan lai dc chia lam nhieu loai nhu don cau,song cau,tu cau, tu cau,lien cau

-Truc khuan: la nhung vk hinh que, dau tron hay vuong,kthuoc cua cac vk gay benh thuong gap la:be rong 1µm,chieu dai 2-5µm.cac truc khuan k gay benh thuong co kthuoc lon hon.Mot so loai truc khuan gay benh thuong gap nhu cac vk lao,thuong han...

-Xoan khuan: la nhung vk co hinh soi luon song va di dong.chieu dai cua cac vk loai nay co the toi 30µm.Trong loai nay co 3 giong vk gay benh quan trong la: Treponema,Leptospira,Borrelia.

-Ngoai nhung vk dien hinh tren con co cac loai vk co hinh the trung gian:

+Trung gian giua cau khuan & truc khuan la cau truc khuan.VD: vk dich hach...

+Trung gian giua truc khuan va xoan khuan la fay khuan.vd fay khuan ta

*Y nghia cua chung trong vi sinh:

-Hinh the co gia tri chan doan trong vi sinh

-Doi khi trong 1 so it truong hop dua vao hinh the t/c bat mau va cac xet nghiem khac trieu chung lam sang=>chan doan dung ve ngnhan gay benh

-Quan sat hthe trong benh fam cua b.nhan co the chan doan chinh xac bnhan bi benh j'.vd: lau cap, mu nieu dao...