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The present study was carried out on 360 of two species of freshwater fishes (200 Oreochromis niloticus and 160 Clarias gariepinus, which were collected randomly and seasonally from different localities in Ismailia governorate from December 2017 to November 2018. Naturally infested fishes revealed no phathognomonic clinical signs except dark coloration and ulcers on skin in O. niloticus and Cl. gariepinus. Postmortem examination showed hemorrhages, abrasions in the skin, presence of yellow cysts embedded in musculature and enlargement of liver with yellowish discoloration in both O. niloticus and Cl. gariepinus. The total infestation rate was 70%; in O. niloticus (62%) and in Cl. gariepinus (80%). The isolated monogenetic trematode was Cichlidogyrus tilapiae from gills of O. niloticus. The isolated digenetic trematodes were Orientocradium batrachoides, Astiorema reniferum and Afromacroderoides lazera from the intestine of Cl. gariepinus. Eumesenia aegypticus was isolated from the intestinal lumen of O. niloticus, while encysted metacercariae (EMC) were isolated from different organs of infested O. niloticus. Confirmation of trematode infestation was done by using molecular diagnosis (PCR). Seasonal distribution and histopathological examinations were also recorded and discussed.

Nasal swabs were obtained from 28 adult sheep attended to teaching hospital belong to the College of Veterinary Medicine, University of Mosul, which showed rhinitis with serous or mucopurulent nasal discharge. Smears were made on clean glass slides, stained with giemsa and examined by oil immersed lens for cellular assessment. Cells have been counted, percentages and averages then calculated for each type of cells, a statistical comparison of average values have been made between samples of the two types of nasal discharges to identify the significant differences using one way analysis of variance and Dunkan tests at P≤ 0.05. The results showed presence of epithelial cells lining nasal cavity, neutrophils, eosinophils, basophils, lymphocytes, monocytes and red blood cells at percentages 29.63%, 14.42%, 13.83%, 0.29%, 14.58%, 5.79% and 20.23% respectively at serous nasal discharge samples and at percentages 30.02%, 26.65%, 1.96%, 0.54%, 17.58%, 6.21% and 16.84% respectively at mucopurulent nasal discharge samples. Statistical analysis demonstrated a significant elevation in percentage ratio of neutrophils at mucopurulent exudate than serous exudate. We concluded from the current study that most cases of rhinitis examined in sheep had an infectious nature rather than allergic.