MeSH definition : A genus of gram-negative, facultatively anaerobic, rod-shaped bacteria occurring in
soil and water. Its organisms are generally nonpathogenic, but some species do cause
infections of mammals, including humans.;
A genus of gram-negative, facultatively anaerobic, rod-shaped bacteria occurring in
soil and water. Its organisms are generally nonpathogenic, but some species do cause
infections of mammals, including humans.