In order to investigate the prevalence of Mannheimia haemolytica infection in cattle, nasal andnasopharyngeal swabs and blood samples were obtained from 250 cattle after slaughter at Ahvaz(southwestern Iran) abattoir. Nasal and nasopharyngeal swabs were cultured on blood agar and incubated at37°C for 24-48 h. The suspected bacterial cultures were processed for isolation of M. haemolytica follow...

Mannheimia haemolytica, Pasteurella multocida, and Bibersteinia trehalosi have been identified in the lungs of pneumonic bighorn sheep (BHS; Ovis canadensis). Of these pathogens, M. haemolytica has been shown to consistently cause fatal pneumonia in BHS under experimental conditions. However, M. haemolytica has been isolated by culture less frequently than the other bacteria. We hypothesized th...

Mannheimia haemolytica is a major bacterial component of bovine respiratory disease (BRD); unfortunately, very little is known about M. haemolytica transmission dynamics among cattle. Identifying potential variation in M. haemolytica populations over time and induction of nasopharyngeal colonization and subsequent shedding are 2 areas where knowledge is lacking. In our study, 2 separate loads o...

Leukotoxin-producing Mannheimia haemolytica consistently causes fatal pneumonia in bighorn sheep (BHS) under experimental conditions. Surprisingly, by culture methods, it has been isolated from pneumonic BHS lungs less frequently than other bacteria. However, in one study PCR assays detected M. haemolytica from over 70% of the pneumonic lung samples that were negative for this organism by cultu...

BACKGROUND Mannheimia haemolytica is an important etiological agent in bovine respiratory disease. OBJECTIVES Explore risk factors for recovery of susceptible and resistant M. haemolytica in feedlot cattle and explore associations with health outcomes. ANIMALS Cattle (n = 5,498) from 4 feedlots sampled at arrival and later in feeding period. METHODS Susceptibility of M. haemolytica isolat...

In order to obtain data concerning the involvement of Mannheimia haemolytica in bovine respiratory disease (BRD) outbreaks, a serological survey was carried out on paired (acuteconvalescent) sera from 1310 beef and 810 dairy cattle collected in 262 BRD outbreaks in Italian herds during 2002-2006. No vaccination program to M. haemolytica A1 was applied in the investigated herds. For each outbrea...

We investigated the dynamics and duration of antibody titer against Mannheimia haemolytica in Japanese Black calves. Twenty unvaccinated calves from two Japanese Black breeding farms in Kagoshima Prefecture, Japan, were studied. The antibody titer against M. haemolytica reached the lowest level at 8 weeks of age after birth. Calves began producing antibody against M. haemolytica by themselves b...

For this study pneumonic lung tissue and tracheal swabs were collected from sheep, goat and cattle slaughtered at Elphora abattoir. From the total of 170 bacterial isolates from sheep lung tissue, 10.6% Bacillus species, 14.7% Mannheimia haemolytica and 42.4% Staphylococcus species were isolated aerobically. The tracheal cultures also indicated that 5.8% were Enterobacter species, 13% were Bibe...

  This study evaluated the nasopharyngeal microbial flora and antimicrobial susceptibility patterns of the one hundred and thirty Holstein calves with dairy calf pneumonia from dairy farms of Mashhad Suburb between September 2002 and August 2003 . The most common micro-organisms isolated were Pasteurella multocida 80 (61.54%), Mannheimia haemolytica 41 (31.54%), Bacillus sp. 15 (11.54%), Staphy...

AIM This study was aimed to detect Mannheimia haemolytica in lung tissues of sheep and from a bacterial culture. INTRODUCTION M. haemolytica is one of the most important and well-established etiological agents of pneumonia in sheep and other ruminants throughout the world. Accurate diagnosis of M. haemolytica primarily relies on bacteriological examination, biochemical characteristics and, bi...