الفهرس 
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Abstract
In the present study, nine hundreds and ten cattles(910) from
various farms that located at Daqahlia province, Egypt, were
examined for the pathology caused by the local FMD and LSD virus
isolates During infection outbreaks during the period from March
2014 to February 2016. and six hundreds and seventy (670)
seemed to be infected with FMD(73.3%). The mortality rate
reached to(36.8%) .Whereas two hundreds and forty (240) appeared
infected with LSD (26.3%) .The mortality rate reached to (18.7%).
The main macroscopic finding ,diseased calves aging below
six month old, showed 100% mortality, and usually showed signs of
sudden death with no apparent gross lesions such as the vesicle
formation on the mouth and the feet. However, the majority of them
showed signs of myocardial necrosis. This characteristic lesion has
been typically observed in FMD virus infection in young calves .
Adult cattles showed oral vesicles and erosions surrounded by
hyperemic zone. Similar lesions were also observed at the coronary
bands, skin of the interdigital space, and the udder. We observed
other less common lesions such as hemorrhage and ulceration of
the rumen and abomasum, necrosis and congestion of the
gastrointestinal tract, atrophied pancreas, inactive ovaries with
cysts, edematous and thickened of Fallopian tube beside
shrunken uterus and contained retained secretion .External
gentilia of a few adult cattles showed vesicles or erosive
mucosae.