Chlamydophila abortus (C. abortus) is one of the most important causative agents of enzootic abortion which has been caused a serious economic problem in domesticated and wild ruminants world wide. This study was aimed to diagnose C. abortus infection in aborted goats in Ras Suder Research Station (South Sinai) - Desert Research Center from 2004-2006. Twenty aborted cases from 130 pregnant nannies were recorded and examined serologically using complement fixation test (CFT). Eighty percent (16/20) of the aborted cases were serologically positive and 20% (4/20) randomly collected from apparently healthy pregnant nannies were also had antibodies against C. abortus. Pathological lesions were detected. Ten aborted fetal samples from serologically positive aborted nannies were subjected to diagnosis using Polymerase Chain Reaction (PCR) showed positive results at 119 bp. According to this result, PCR proved to be feasible, reliable, specific and sensitive diagnostic tool in diagnosis of C. abortus infection.

This study was carried out on 180 pregnant ewes located at Ras Sedr research station - desert research center, from 2003 to 2005. Twenty five cases of abortion were recorded and examined serologically by complement fixation test (CFT). 17 (68%) out of these 25, showed positive results against Chlamydophila abortus and 3(15%) out of 20 apparently healthy pregnant ewes were serologically positive. Due to the fact that both clinical signs and pathological findings are not specific in case of chlamydial infection and also due to the fact that CFT is accompanied by false positive reactions due to cross reactivity between chlamydial species, five samples from serologically positive aborted dams were subjected to polymerase chain reaction (PCR). They revealed positive results for Chlamydophila abortus at 119 bp. Therefore, PCR is proven to be reliable, rapid and specific diagnostic technique in the diagnosis of chlamydial infection.

This study was carried out on 68 randomly collected chickens located at Ras Sedr Research Station, Desert Research Center, 68 serum samples were examined serologically by complement fixation test (CFT). Twenty out of 68 (29.91%) had antibodies against Chlamydophila psittaci . Ten blood samples of the serologically positive cases were subjected to polymerase chain reaction (PCR) and showed positive results for Chlamydophila psittaci at 119 bp. Therefore PCR was found to be reliable, rapid, sensitive and specific technique for the detection Chlamydophila psittaci in birds. Serologically positive birds did not show any clinical symptoms of disease, but they were in contact with sheep and goat that showed previous abortion and were positive for C. abortus. It is recommended to avoid breeding of chickens with other animal species in the same yard because chickens become asymptomatic carrier with shedding of Chlamydophila psittaci in their feaces and respiratory discharges.