5Atmar,D.L.1999.Chlamydin Species and Mycoplasm Pneumoniae.Curr.Infect.Dis.Rep.1:73-79.
6Mardh,P.A.et.al.1998.Symptoms an signs in single and mixed genital infections.Int.J.Gynaecol.Obstet.63:145-152.
7Bettelheim.K.A.et.al.1999.Combined infection of Norwalklike virus and verotoxin-producing bateria associated with a gastroenteritis outbreak.J.Diarrhoeal Dis.Res.17:34-36.
8Clarke.J.K.et.al.1992.Mixed infection with one species of microorganism.Vet.Rec.130:20.
9Bionde,M.et.al:1997.Psychological stress,neuroimmunomodulation,and susceptibility to infectious diseases in animals and man:a review.Psychother.Psychoeom.66:3-26.
10Gilmour.N.J.L,1980.Pasteurella haemolytica infections in sheep.Vet.Q.2:191-198.