Japanese Journal of Veterinary Research;Volume 17, Number 4

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THE SEASONAL TRANSITION OF FECAL ISOLATIONS OF ENTEROPATHOGENIC ESCHERICHIA COLI FROM HEALTHY MILKING COWS

YABIKI, Terutake;HAMADA, Sukekazu

Permalink : http://hdl.handle.net/2115/1936
JaLCDOI : 10.14943/jjvr.17.4.105

Abstract

The fecal isolations of enteropathogenic E. coli for humans in a herd of 40 healthy milking cows were tested every month between February and November, 1967. The results obtained are summarized as follows : 1) The enteropathogenic E. coli was isolated from the feces of 29 out of 40 healthy milking cows, with no isolations in the summer months. In only 1 cow, the organism was continuously detected twice or more both in the spring months and in the autumn months. In this case, the dominant serotype was O126,but the same serotype was not always detected every month. 2) Out of the 29 positive cows, 21 were positive in the spring months only. In these cows also, the same serotype was not always detected every month. 3) In 25 positive cows, the frequency of isolation of the organism was less than two times, and, in 3 cows three times and in only 1 cow six times. The number of cows in which the same serotype was detected twice over a period of consecutive months was only 3. The number of cows in which the same serotype was intermittently detected twice was only 4. 4) In all 29 positive cows, the number of the organisms isolated in 1 sample was under 8,and in most of the positive samples it was very few-under 3. 5) There was no case in which the enteropathogenic E. coli has proved a direct cause of scouring. 6) The serotypes of 93 strains isolated were divided into 10 different serotypes : O26,O28a, c, O112a, c, O125,O126,O127a, O128,O136,O144 and O146. Among them, O112a, c, O126 and O128 were dominant, and, O112a, c was concentrically detected in the spring months only, and, O126 and O128 were detected both in the spring and autumn months. 7) The serotypes detected twice over a period of months were O128 and O126,and, the former in 2 cases and the latter in 1 case. The serotypes detected twice intermittently over the ten month period were O112a, c, O128 and O126. The O112a, c was isolated from 2 cases, and, the O128 and the O126 from 1 case each. 8) In the present study, the enteropathogenic E. coli was isolated with higher frequency in the spring months than in the autumn months, and, the dominant serotypes detected were O112a, c, O126 and O128 in a herd. These results were in accord with the results obtained in our previous report.

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