realized in has disposition at some time agent_in_compromised_process artificially mutated Brucella attenuated disposition mouse - Brucella interaction Brucella omp19 mutant MUTATION: Omp19 is an immunoreactive outer membrane lipoprotein. Significantly fewer brucellae were recovered from the spleens of mice infected with the omp19 mutant than from those of mice infected with the parent strain at 4 and 8 weeks postinfection. The omp19 mutant exhibited an increase in sensitivity to the polycation polymyxin B and to sodium deoxycholate. These results indicate that inactivation of the omp19 gene alters the outer membrane properties of B abortus [Ref6473:Tibor et al., 2002]. See PMID:12228280 Brucella entry into host cell