Streptococcus spp

Streptococcal infections are nonclinical and may spread between humans and animals, mostly by droplet infection through the intranasal route. Hemolytic streptococci and S. pneumoniae are, according to the FELASA guidelines for health monitoring,48 the only ones to be reported, although their importance is probably questionable and some other types may be pathogenic as well. Prevalences within infected barrier bred colonies are generally around 10%.2 Group C in guinea pigs as well as group G and A in rats and mice may be the cause of various pyogenic processes. S. pneumoniae may be found in guinea pigs, more seldom in rats and rabbits, and in rare cases in mice. The prevalence within infected colonies may vary from 15 to 55%. Disease is mostly related to stress, e.g., due to a poor environment or nutritional deficiencies. In rats, a mucopurulent discharge from the nose may initially be observed, and later the disease may progress into a noisy, abdominal respiration. Pathological changes are dominated by fibrin with various grades of focal bronchopneumonia developing into lobar fibrinous pneumonia. In guinea pigs, unexpected deaths are often the only visible signs of infection, while in rabbits, dyspnoea and depression often quickly turn into septicemia.5

0 0

Post a comment