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Kocuria varians infection associated with brain abscess: A case report
© Tsai et al; licensee BioMed Central Ltd. 2010
Received: 28 November 2009
Accepted: 27 April 2010
Published: 27 April 2010
Kocuria, established by Stackebrandt et al., previously was classified into Micrococcus. Only two species, K. rosea and K. kristinae are reported to be associated as pathogenic and found with catheter-related bacteremia and acute cholecystitis.
We herein report the first case of brain abscess caused by Kocuria varians, a gram-positive microorganism, in a 52-year-old man. Hematogenous spread is the probable pathogenesis.
This report presents a case of Kocuria varians brain abscess successfully treated with surgical excision combined with antimicrobial therapy. In addition, Vitek 2 system has been used to identify and differentiate between coagulase-negative staphylococcus.
Kocuria spp. are gram-positive, strictly aerobic microorganisms. Previously they were classified into genus Micrococcus, but have now been removed from Micrococcus based on phylogenetic and chemotaxonomic analysis . This bacterial cluster consists of nine species and is generally considered to be non-pathogenic commensals that colonize the skin, mucosa and oropharynx. However, they can be opportunistic pathogens in immunocompromised patients, though documented cases of infections are rare. We describe a case which presented as a brain abscess caused by Kocuria varians. To our knowledge, this is the first reported case of Kocuria varians associated with brain abscess in the English literature.
The incidence of brain abscess varies between 1500 to 2500 cases/year in the US, with higher incidences in developing countries . It occurs with the following predisposing sources: 1) contiguous spread; 2) hematogenous spread; 3) head trauma; and 4) neurosurgical procedure. According to the previous literature, the most common modes of direct contiguous spread were from the middle ear, mastoid infections and paranasal sinus . But nowadays, hematogenous spread has become the most common source . The organisms that cause brain abscess are typically bacterial in origin. Streptococcus and staphylococcus are the most frequent organisms and can be isolated from abscesses of all types and at all sites, whereas Enterobacteriaceae and Bacteroides spp. are isolated from otogenic temporal lobe abscess . In neonates, Proteus and Citrobacter spp. are the most common organisms. Occasionally Mycobacterium tuberculosis as well as fungal infections can act as organisms. Listeria monocytogenes and Burkholderia pseudomallei are rarely reported . Micrococcus spp. associated with brain abscess is mentioned in only two case reports in the English literature [5, 8]. In reviewing the English literatures, Kocuria varians related to brain abscess has not yet been documented. Our case is the first reported case in which brain abscess is caused by Kocuria varians.
Kocuria spp. are gram-positive, aerobic microorganisms and found as normal skin flora in humans and other mammals. Infections related to Kocuria spp. are uncommon but can be opportunistic pathogens in immunocompromised patients with underlying diseases. Kocuria spp. was previous classified as Micrococcus spp. Recently, Stackebrant and colleagues made a taxonomic revision of Micrococcus spp. and reclassified it in the new genus Kocuria spp. (Kocuria rosea; K. kristinae; K. varians; K. palustris; and K. rhizophila ap. Nov.) [2, 6]. The organism Micrococcus luteus has been reported as a pathogen in meningitis , intracranial abscess , arthritis , pneumonia  catheter-related sepsis in patients with hemodialysis , or leukemia treatment . K. rosea and K. kristinae have been reported as pathogens causing catheter-related bacteremia and acute cholecystitis [13–15]. Due to the normal flora of skin or oropharynx and the reported catheter-related bacteremia of other species, the possible predisposing source of Kocuria varians is by hematogenous spread to brain parenchyma.
Due to phenotypic variability, misidentification of coagulase-negative staphylococcus as Kocuria by using standard biochemical analysis is common . Therefore the Vitek 2 system has been used, which is scored as being "very good identification" and is reportedly used in both morphotypes . Also the utilization of genotypic assay, such as 16s RNA is used to confirm species identity .
Most strains of Kocuria and Micrococcus were reported to be sensitive to doxycycline, ceftriaxone, cefuroxime, amikacin, and amoxicillin and erythromycin , but in consideration of BBB and penetration of the abscess capsule, third-generation cephalosporins should be used. In our case, surgical excision was performed and then third-generation cephalosporins were administered intravenously for 4 weeks and then shifted to oral form third-generation cephalosporins for 2 weeks as an adequate therapy.
Herein we report the first case of Kocuria varians associated with brain abscess in the reviewing the English literature. Because Kocuria spp. is found as normal flora and the hematogenous spread of other related species in reported cases, we supposed Kucuria varians caused brain abscess by hematogenous spreading. Besides Vitek 2 system, 16s RNA may be additionally used to confirm and thus avoid misidentification as coagulase-negative staphylococcus. Surgical excision combined with third-generation cephalosporins could serve as an excellent standard therapy for Kocuria varians brain abscess.
Written consent was obtained from the patient for publication of this case report.
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