Evolutionary genetics of Pasteurella haemolytica isolates recovered from cattle and sheep.
نویسندگان
چکیده
Genetic diversity and relationships among 194 Pasteurella haemolytica isolates, which were recovered predominantly from cattle (39%) and sheep (58%) suffering from pneumonic pasteurellosis in the United Kingdom, Germany, and the United States, were estimated by examination of allelic variation at 18 enzyme-encoding loci detected by multilocus enzyme electrophoresis. The isolates formed two major divisions. One included 178 Pasteurella haemolytica sensu stricto strains representing serotypes A1, A2, A5 to A9, A12 to A14, and A16; the other was composed of 16 isolates belonging to the A11 taxon. P. haemolytica isolates were classified into 22 electrophoretic types (ETs) that formed three primary phylogenetic lineages. One lineage was represented by ovine serotype A2 isolates, a second lineage consisted of bovine serotype A2, together with serotype A7 and A13 isolates, and the third lineage included isolates representing all of the other serotypes, as well as a second group of serotype A7 strains. Electrophoretic types were nonrandomly associated with specific capsular serotypes, lipopolysaccharide (LPS) types, outer membrane protein (OMP) types, and host species. Bovine isolates were represented by only three serotypes (A1, A2, and A6) in 5 ETs, whereas ovine isolates were represented by all of the serotypes in 19 ETs. The majority (76%) of bovine isolates were of serotypes A1 or A6 and belonged to a single ET that marked a virulent, cattle-specific clonal group. Among the ovine isolates, 40% were of serotype A2 and belonged to two ETs that represented two virulent, sheep-specific clonal groups. Bovine A1 and A6 isolates and bovine A2 isolates were phylogenetically distinct from ovine isolates of the same serotypes, indicating that different subpopulations of these serotypes are associated with disease in cattle and sheep. Consistent differences in the OMP profiles of strains of the bovine and ovine lineages of these three serotypes suggest that certain OMPs are involved in host specificity and virulence. Evolutionary relationships among P. haemolytica isolates indicate that the ancestral host is the sheep and that several distinct clonal lineages have crossed the species barrier into cattle. The A11 taxon is a heterogeneous group of opportunistic pathogens of sheep that represents a separate species.
منابع مشابه
Phenotypic characterisation of Australian sheep and cattle isolates of Mannheimia haemolytica, Mannheimia granulomatis and Mannheimia varigena.
OBJECTIVE To perform a comprehensive phenotypic characterisation of 35 isolates of bacteria previously identified as haemolytic Pasteurella-Actinobacillus and obtained from cattle and sheep. DESIGN The 35 isolates that had been obtained from Australian animals, 30 from cattle and five from sheep, were compared with reference strains of the five recognised species of the genus Mannheimia--M. h...
متن کاملThe distribution of Pasteurella haemolytioa serotypes among cattle , sheep and goats II South Africa and tbeir assocJation
ODENDAAL, M.W., & HENTON, M.M. 1995. The distribution of Pasteurella haemolytica serotypes among cattle, sheep and goats in South Africa and their association with disease. Onderstepoort Journal of Veterinary Research, 62:223-226 Over an 8-year period (September 1986 to March 1994), a total of 497 organ specimens from sheep and goats and 96 from cattle, were received for the isolation of Pasteu...
متن کاملFatal pneumonia following inoculation of healthy bighorn sheep with Pasteurella haemolytica from healthy domestic sheep.
In a series of three experiments, isolates of Pasteurella haemolytica biotype A, serotype 2, ribotype reference WSU-1, from healthy domestic sheep, were inoculated intratracheally into eight bighorn sheep (Ovis canadensis canadensis) and seven domestic sheep with doses of bacteria ranging from 5.3 x 10(8) to 8.6 x 10(11) colony forming units. Seven of eight inoculated bighorn sheep died from ac...
متن کاملIn vitro antimicrobial susceptibility of Pasteurella haemolytica and Pasteurella multocida recovered from cattle with bovine respiratory disease complex.
The antimicrobial susceptibilities of 421 Pasteurella haemolytica and 158 P. multocida isolates recovered from cattle with respiratory disease were determined with a microdilution minimal inhibitory concentration test system. Isolates were analyzed for patterns of resistance to ampicillin, ceftiofur, erythromycin, gentamicin, penicillin, spectinomycin, sulfachlorpyridazine, sulfadimethoxine, te...
متن کاملPhylogenetic diversity of Pasteurellaceae and horizontal gene transfer of leukotoxin in wild and domestic sheep.
Wild and domestic animal populations are known to be sources and reservoirs of emerging diseases. There is also a growing recognition that horizontal genetic transfer (HGT) plays an important role in bacterial pathogenesis. We used molecular phylogenetic methods to assess diversity and cross-transmission rates of Pasteurellaceae bacteria in populations of bighorn sheep, Dall's sheep, domestic s...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Infection and immunity
دوره 65 9 شماره
صفحات -
تاریخ انتشار 1997