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Abstract
The role played by E. coli in producing diarrhoea in calves has
received a great attention of many authors, the importance of other
bacteria, however, has not been fully investigated.
In this study 113 out of 296 faecal samples collected from buffalo-
calves showed clinical signs of diarrhoea were found to be positive for
bacteriological examination and harboured Escherichia coli with an
incidence of38.17%.
All isolates proved to be E. coli by culture method, morphological
appearance and biochemical reaction were submitted to serological
identification using O:K serotypes (Welcome) and K99 antisera
prepared in the laboratory using standard strains and the results
obtained showed that the most predominant serovars were 055 : K59
(85),0111: K58 (B4) , 026 : K60 (B6) , 0119: K6(B14) , 0126:
K71 (B16) and 086 : K61 (B7) and 0125 : K70(B15). In addition to 29 strains that could not be serologically identified, this might be due to the presence of other serovars against which no diagnostic sera were available. All E. coli isolates were serologically identified using K99
antisera and the obtained results showed that 56 strains proved to be
K99 +ve.
The association between E. col i strains and calf age was present and obtained results showed that the high incidence was in the first day (44.00/0) followed by 40.3%, 39.3%, 38.5, 31.42 and