Pasteurella multocida meningitis is a rare clinical occurrence. We report a new case and review the 28 other cases described in the English literature. A history of recent animal contact remains strongly associated with P. multocida meningitis (noted in 89% of all cases), with licking of mucus surfaces or injured skin being most common. Bacteremia was present in 63% of all patients. Spread from an adjacent site of infection continues to be an important factor, with otitis media being documented or strongly suspected in 24% of all cases. The presenting signs and symptoms were characteristic of bacterial meningitis, with fever, headache, nucal rigidity and an altered level of consciousness being present in most patients. Cerebrospinal fluid analysis was typical for bacterial meningitis. Penicillin G or ampicillin was the most common definitive treatment; however, third-generation cephalosporins have been successful. The mean duration of treatment was 14 d. Neurologic complications were present in 17% of patients overall and mortality remains substantial at 25%. Although not statistically significant, there is a trend toward decreased neurologic complications and mortality during the last 11 y.
Infection with Ehrlichia canis should be suspected in patients with fever, headache, malaise, leukopenia, thrombocytopenia, and a history of recent exposure to ticks. The cytopenia is caused by bone marrow hypoplasia which may be severe. The disease may be confused with spotless Rocky Mountain spotted fever but can be differentiated from this infection serologically with acute and convalescent sea. In humans, recovery has occurred with and without antibiotic therapy. However, prompt antibiotic therapy is advised prior to serologic studies, especially in immunocompromised individuals, splenectomized persons, and patients with AIDS-who may develop a more overwhelming rickettsial infection.
A case of Myroides odoratus cellulitis with bacteremia in an apparently immunocompetent man is presented. Although common in soil and water, this agent is a rare clinical isolate and is often not considered pathogenic. The virulence of M. odoratus may be greater than is currently believed and it should be considered in bacteremias from cutaneous sources in immunocompetent patients.
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