author(s)
A Tikoo, JS Soodan, Gagandeep Singh and R Agrawal

abstract
A total of 158 diarrheic fecal samples from calves were examined for identifying the etiology of the diarrhea. Out of the total samples 94 samples were found positive for E. coli. Serotyping of all these E. coli isolates revealed that all, these E. coli isolates belonged to 19 different serogroups and the, predominant amongst them was O2 with 14 strains, O59 with 11 strains, O123 with 10, O56 with 8 and various other strains. For the in vitro antibiogram, all the isolates were grouped into seven different groups and in these groups, three groups were sensitive and four resistant to Ampicillin (A), four were sensitive and three groups resistant to Ampicillin/cloxacillin (Ac), three were sensitive and four groups resistant to Chloramphenicol (C), five groups were sensitive and two groups resistant to Ciprofloxacin (Cf), six groups were sensitive and one resistant to Enrofloxacin (En), one group was sensitive and six resistant to Gentamicin (G), none of the groups was sensitive but all the seven groups were resistant to Streptomycin (S), Sulphamethiozole (SF), one group was sensitive and six resistant to Sulphadiazene (Sd) and two groups were sensitive and five resistant to Trimethoprim (Tr).