الفهرس 
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Abstract
This study has thrown some light on neonatal diarrhea in Egypt which represents one of the main cause of mortality in newborn calves. Therefore a total number of 450 cattle fecal samples (369 samples from diarrhoeic calves, 81 clinically healthy one) were collected from different farms and villages in Assiut Governorate such as (EI-Awamer farm, Farm of FacuIty of Agriculture, Assiut University, Bani-Mur, Abnob-Elhamam , EI-Motia and Korkars); from El-diabat Farm in Sohag and from Cattle Friesian at Quena which had complain from calf diarrhea. i . The age of calves ranged from 1 day and 3 months. Calves were subjected to clinical and laboratory examination for detection of rota and/or corona virus antigens in faecal samples of newborn calves suffering from diarrhea. The main clinical signs in diseased calves varied from mild, moderate, to profuse profuse watery diarrhoea. faeces were tinged with mucous or blood. Some clinieally healthy calves have rota or coronavirus antigen. Calves showed weakness, severe depression, unable to stand, arched back, off food and variable degree of dehydration. rectal temperature was high in some cases or normal and subnormal prior to death. In this study, three different laboratory tests were carried out to clarify the easiest, most rapid and economic test or tests for routine diagnosis of coronavirus antigens, in faeces of diarrhaeic calves and clinically healthy one. Dot-ELISA, Haemagglutination, Haemagglutination Inhibition test used for detection of corona virus antigens in faeces of diarrhaeic calves, the percentages of positive samples were 38.9%, 56.4% and 24.9% respectively. In order to detect rotavirus antigen in faecal samples, Dot-ELISA was used, the percentage of positive samples was 50.9% . samples were chosen for detection of rotavirus antigens. The percentage of positive samples was 63.3% and 66.6% respectively. from the over mentioned results, it could be concluded that: 1- Rota and/or coronavirus were incriminated to play an important role in the aetiology of neonatal calf diarrhea problems in Egypt leading to great economIC losses facing live stock production and the presence of these VIruses in clinically calves and so this has an important role for epidemiological and laboratory diagnostic studies, 2- Dot-ELISA test is highly sensitive test for detection of rota and/or coronavirus antigen. 3- Latex agglutination test can be used as a field test which is rapid gives results within two minutes without need for laboratory instrument as in other tests.