Background Histophilus somni, a gram-negative coccobacillus, can be an obligate inhabitant of bovine and ovine mucosal surfaces, and an opportunistic pathogen responsible for respiratory disease and other systemic infections in cattle and sheep. The polysaccharide was present in large amounts in broth culture sediment after H. somni was produced under low oxygen tension for 4-5… Continue reading Background Histophilus somni, a gram-negative coccobacillus, can be an obligate inhabitant