The occurrence of otitis externa in dogs in relation to ear types, age‐group, sex, months and seasons of the year and microbiology of canine ears was studied.
The oral administration of an 18-hr broth culture of Escherichia coli 06: isolated from a cat to 3-day-old gnotobiotic (germ-free) piglets resulted in bacteremia and polyserositis. Sixteen pigs, selected from four litters, were used in the study. E. coli of the same serotype employed was the only bacterial agent demonstrable and recovered from moribund and dead piglets. Attempts to recover virus or PPLO (mycoplasma) from these animals were unsuccessful. A polyserositis syndrome was not encountered among neonatal pigs in experiments with 14 other serotypes of E. coli; hence it was considered to be a syndrome closely associated with the infection caused by this particular strain of E. coli.
Three strains of Escherichia coli isolated from infectious processes in a calf, a dog, and a cat were examined for their capacity to produce disease or death, or both, in newborn gnotobiotic piglets. The 0 groups represented by these particular strains of E. coli were 04: (canine origin), 06: (feline origin), and 039: (bovine origin). All three isolates upon oral administration proved to be pathogenic. Infection with the E. coli 04: (canine) or 039: (bovine) consistently produced signs of enteric colibacillosis and death in all 1-and 3-day-old piglets within 24 to 48 hr. The 06: (feline) isolate, on the other hand, produced a marked polyserositis and generally required 6 to 7 days to kill a piglet. Only the respective type of E. coli used in the particular trial was recovered from the diseased piglets. These findings suggest the possible role of domestic animals and household pets in the spread of potentially pathogenic E. coli to other species.
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