Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Microorganisms detected from nasal discharges of calves before and at the onset of pneumonia.

Abstract

Results from bacteriological studies of nasal swabs from 123 calves at their introduction to three farms, indicated that 7- to 10-day-old calves already harboured Micrococcaceae (45.5%), Streptococcaceae (38.2%), Pasteurella multocida and Mycoplasma bovirhinis (8.1% each) and other bacteria in their nasal tracts. Ureaplasma diversum was not detected in calves at their introduction, but was isolated from 14 of 28 calves with pneumonia examined 9-77 days after introduction. No viruses were isolated, but serological tests indicated that infection with bovine rhinovirus had occurred in some of the pneumonic calves. In view of the significant increases in isolations of U. diversum, M. bovirhinis and P. multocida from pneumonic calves in comparison with samples taken at introduction, it is concluded that all three are involved as pathogens in calf pneumonia.