Genetic diversity and tetracycline resistance genes of Histophilus somni.

Nasal swabs were collected at three time points from 2378 calves in four feedlots and cultured for Histophilus somni to assess genetic relatedness and tetracycline resistance. The proportions of animals carrying tetracycline resistant isolates were 0.32% at arrival, 14.

Pseudomonas aeruginosa las and rhl quorum-sensing systems are important for infection and inflammation in a rat prostatitis model.

Pseudomonas aeruginosa frequently acts as an opportunistic pathogen of mucosal surfaces; yet, despite causing aggressive prostatitis in some men, its role as a pathogen in the prostate has not been investigated. Consequently, we developed a Ps. aeruginosa infection model in the rat prostate by instilling wild-type (WT) Ps.

Evaluation of experimental methods to induce congenital hypothyroidism in guinea pigs for use in the study of congenital hypothyroidism in horses.

Objective: To develop a method to reliably induce congenital hypothyroidism in guinea pigs (Cavia porcellus) and assess similarities between the resultant developmental abnormalities and those described in horses with congenital hypothyroidism.

Animals: 35 female guinea pigs and their offspring.

Procedure: Guinea pigs were allocated to control groups or groups treated with a low-iodine diet before and throughout gestation; an s.