BACKGROUND/AIMS: We evaluated the clinical features of ciprofloxacin-resistant Proteus mirabilis bacteremia and risk factors for ciprofloxacin resistance. METHODS: From October 2000 to July 2009, 37 patients with clinically significant P. mirabilis bacteremia were identified and data from patients with ciprofloxacin-resistant and ciprofloxacin-susceptible P. mirabilis bacteremia were compared. RESULTS: The most common underlying diseases were neurologic disease (37.8%) and solid tumors (29.7%). The most common site of infection was the urinary tract (35.1%). Ten of the 37 patients (27.0%) were infected with ciprofloxacin-resistant isolates, and univariate analysis revealed a significant relationship between ciprofloxacin-resistant P. mirabilis bacteremia and neurologic disease, recent operation, L-tube insertion, percutaneous tube use, and extended-spectrum beta-lactamase (ESBL) production (all p < 0.05). ESBL was detected in six of 10 (60%) ciprofloxacin-resistant isolates, while only three of 27 (11%) ciprofloxacin-susceptible isolates produced ESBL (p = 0.005). In a logistic regression analysis, ESBL production remained a significant factor associated with ciprofloxacin resistance, after adjusting for other variables. CONCLUSIONS: These data indicate a close association between ciprofloxacin resistance and ESBL-production in P. mirabilis bacteremia. This association is particularly troublesome because the therapeutic options for serious infections caused by ESBL-producing P. mirabilis are severely restricted.
Adult ; Aged ; Anti-Infective Agents/*pharmacology ; Bacteremia/*drug therapy ; Ciprofloxacin/*pharmacology ; Drug Resistance, Bacterial ; Female ; Humans ; Male ; Middle Aged ; Proteus Infections/*drug therapy ; Proteus mirabilis/*drug effects/enzymology ; Risk Factors ; beta-Lactamases/*biosynthesis

We report a case of spontaneous bacterial peritonitis from Ochrobactrum anthropi. O. anthropi is recognized as an emerging pathogen in immunocompromised patients. In contrast to most previously described cases, the patient reported here had no indwelling catheter. To our knowledge, no case of O. anthropi spontaneous bacterial peritonitis has been reported in the medical literature until now.
Treatment Outcome ; Rare Diseases/diagnosis/drug therapy/microbiology ; Peritonitis/*diagnosis/drug therapy/*microbiology ; Ochrobactrum anthropi/drug effects/*isolation & purification ; Middle Aged ; Male ; Humans ; Gram-Negative Bacterial Infections/*diagnosis/drug therapy/*microbiology ; Anti-Bacterial Agents/administration & dosage

Gemella species are opportunistic pathogens, which cause endocarditis, meningitis, musculoskeletal infections, or pulmonary infections. It is difficult to identify all strains of these species by a conventional culture system. Because 16S rRNA gene has the interspecific polymorphisms to differentiate the bacterial species, 16S rRNA gene sequence analysis could be used to identify these pathogens. To determine the molecular types of two unidentified Gram-positive cocci from two patients with infective endocarditis, PCR amplification and DNA sequencing of the 16S rRNA gene were performed. These sequences of the PCR product were compared with known 16S rRNA gene sequences using GenBank BLAST search. The 16S rRNA gene sequences of two isolates showed > 99% nucleotide similarities with those of Gemella morbillorum (GenBank accession number L14327). Phylogenetic analysis also indicated the close relatedness between these isolates and G. morbillorum.
Databases, Nucleic Acid ; Endocarditis* ; Gemella* ; Genes, rRNA ; Gram-Positive Cocci ; Humans ; Meningitis ; Polymerase Chain Reaction ; RNA, Ribosomal, 16S* ; Sequence Analysis ; Sequence Analysis, DNA

BACKGROUND: Post-transplantation lymphoproliferative disorder (PTLD) after liver transplantation is a rare but potentially fatal disease. Clinical manifestations and prevalence of PTLD after liver transplantation in Korea have not been investigated thoroughly. MATERIALS AND METHODS: A retrospective chart review was done for 284 liver transplant recipients at Samsung Medical Center, Seoul, Korea during the period from 1996 to 2003. RESULTS: The incidence of PTLD after liver transplantation was 3.9% (11/284). PTLDs were more prevalent in children (9/55, 16.4%) than in adults (2/237, 0.9%; P<0.01). Among the PTLD patients, four cases were male (36.3%) and seven were female (63.7%). Median time from the transplantation to PTLD diagnosis was 9 months. The type of PTLD was as follows:early lesion (6 cases, 54.5%), polymorphic PTLD (3 cases, 27.3%), and B cell lymphoma (2 cases, 18.2%). PTLDs were more prevalent in the patients with cyclosporine use (OR 13.28, 95% CI:1.29-136.31, P=0.03), acute rejection (OR 5.63, 95% CI:1.03-30.62, P=0.04), and negative serology for EBV VCA IgG (OR 19.15, 95% CI:1.99-183.98, P=0.01) by multivariate logistic regression. Three patients (27.3%) died of B cell lymphoma (2 cases) and polymorphic PTLD (1 case). The remaining patients were improved with reduction of immunosuppression and treatment with acyclovir. CONCLUSION: The incidence of PTLD was high in children. The risk factors of PTLD were negative serology for EBV VCA IgG, history of acute rejection, and cyclosporine use. Considering the poor prognosis of PTLD, effective strategies for prevention and early diagnosis for early treatment should be emphasized.
Acyclovir ; Adult ; Child ; Cyclosporine ; Diagnosis ; Early Diagnosis ; Female ; Herpesvirus 4, Human ; Humans ; Immunoglobulin G ; Immunosuppression ; Incidence ; Korea ; Liver Transplantation* ; Liver* ; Logistic Models ; Lymphoma, B-Cell ; Lymphoproliferative Disorders* ; Male ; Prevalence ; Prognosis ; Retrospective Studies ; Risk Factors ; Seoul ; Transplantation

OBJECTIVE:To evaluate the clinical usefulness of cytomegalovirus (CMV) antigenemia assay among liver transplant recipients in Samsung Medical Center. MATERIALS AND METHODS: All recipients of liver transplantation during the period from Jan. 1996 to Aug. 2003 were enrolled. Medical records and microbiologic data for CMV infections were reviewed retrospectively. RESULTS: All 284 enrolled patients received livers from CMV seropositive donors, and 272 recipients (95.8%) were CMV seropositive before transplantation. One hundred thirty three recipients (46.8%) had evidences of CMV reactivation. Among patients with CMV reactivation, 40 recipients were symptomatic (30.1%) and 12 patients had organ-specific CMV diseases. Most of the CMV infections occurred within 180 days after transplantation except for 9 patients (6.7%). Among the antigenemia positive patients, the mean number of CMV antigen-positive WBC was 19.36 per 200,000 cells (19.36+/-37.64 cells). The mean duration of CMV antigenemia was 8.72 days (8.72+/-9.99 days). Peak value of CMV antigenemia was significantly higher in symptomatic patients compared to asymptomatic patients (P=0.002). Duration of CMV antigenemia was significantly longer (P=0.002) in symptomatic patients. If we would use > or = 5 cells of CMV antigenemia as a cut-off value sensitivity and specificity for symptomatic CMV infections would be 85% and 50% respectively. CONCLUSION: About half of the recipients experienced CMV reactivation, mostly within 180 days after liver transplantation. Thirty percents of reactivation were symptomatic. Five cells per 200,000 leukocytes of CMV antigenemia was the best cut-off level for preemptive treatment.
Cytomegalovirus* ; Humans ; Leukocytes ; Liver Transplantation* ; Liver* ; Medical Records ; Retrospective Studies ; Sensitivity and Specificity ; Tissue Donors ; Transplantation

BACKGROUND: Post-transplantation lymphoproliferative disorder (PTLD) after liver transplantation is a rare but potentially fatal disease. Clinical manifestations and prevalence of PTLD after liver transplantation in Korea have not been investigated thoroughly. MATERIALS AND METHODS: A retrospective chart review was done for 284 liver transplant recipients at Samsung Medical Center, Seoul, Korea during the period from 1996 to 2003. RESULTS: The incidence of PTLD after liver transplantation was 3.9% (11/284). PTLDs were more prevalent in children (9/55, 16.4%) than in adults (2/237, 0.9%; P<0.01). Among the PTLD patients, four cases were male (36.3%) and seven were female (63.7%). Median time from the transplantation to PTLD diagnosis was 9 months. The type of PTLD was as follows:early lesion (6 cases, 54.5%), polymorphic PTLD (3 cases, 27.3%), and B cell lymphoma (2 cases, 18.2%). PTLDs were more prevalent in the patients with cyclosporine use (OR 13.28, 95% CI:1.29-136.31, P=0.03), acute rejection (OR 5.63, 95% CI:1.03-30.62, P=0.04), and negative serology for EBV VCA IgG (OR 19.15, 95% CI:1.99-183.98, P=0.01) by multivariate logistic regression. Three patients (27.3%) died of B cell lymphoma (2 cases) and polymorphic PTLD (1 case). The remaining patients were improved with reduction of immunosuppression and treatment with acyclovir. CONCLUSION: The incidence of PTLD was high in children. The risk factors of PTLD were negative serology for EBV VCA IgG, history of acute rejection, and cyclosporine use. Considering the poor prognosis of PTLD, effective strategies for prevention and early diagnosis for early treatment should be emphasized.
Acyclovir ; Adult ; Child ; Cyclosporine ; Diagnosis ; Early Diagnosis ; Female ; Herpesvirus 4, Human ; Humans ; Immunoglobulin G ; Immunosuppression ; Incidence ; Korea ; Liver Transplantation* ; Liver* ; Logistic Models ; Lymphoma, B-Cell ; Lymphoproliferative Disorders* ; Male ; Prevalence ; Prognosis ; Retrospective Studies ; Risk Factors ; Seoul ; Transplantation

OBJECTIVE:To evaluate the clinical usefulness of cytomegalovirus (CMV) antigenemia assay among liver transplant recipients in Samsung Medical Center. MATERIALS AND METHODS: All recipients of liver transplantation during the period from Jan. 1996 to Aug. 2003 were enrolled. Medical records and microbiologic data for CMV infections were reviewed retrospectively. RESULTS: All 284 enrolled patients received livers from CMV seropositive donors, and 272 recipients (95.8%) were CMV seropositive before transplantation. One hundred thirty three recipients (46.8%) had evidences of CMV reactivation. Among patients with CMV reactivation, 40 recipients were symptomatic (30.1%) and 12 patients had organ-specific CMV diseases. Most of the CMV infections occurred within 180 days after transplantation except for 9 patients (6.7%). Among the antigenemia positive patients, the mean number of CMV antigen-positive WBC was 19.36 per 200,000 cells (19.36+/-37.64 cells). The mean duration of CMV antigenemia was 8.72 days (8.72+/-9.99 days). Peak value of CMV antigenemia was significantly higher in symptomatic patients compared to asymptomatic patients (P=0.002). Duration of CMV antigenemia was significantly longer (P=0.002) in symptomatic patients. If we would use > or = 5 cells of CMV antigenemia as a cut-off value sensitivity and specificity for symptomatic CMV infections would be 85% and 50% respectively. CONCLUSION: About half of the recipients experienced CMV reactivation, mostly within 180 days after liver transplantation. Thirty percents of reactivation were symptomatic. Five cells per 200,000 leukocytes of CMV antigenemia was the best cut-off level for preemptive treatment.
Cytomegalovirus* ; Humans ; Leukocytes ; Liver Transplantation* ; Liver* ; Medical Records ; Retrospective Studies ; Sensitivity and Specificity ; Tissue Donors ; Transplantation

Panton-Valentine leukocidin (PVL)-positive USA300 clone has been the most successful community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) clone spreading in North America. In contrast, PVL-negative ST72-CA-MRSA has been predominant in Korea, and there has been no report of infections by the USA300 strain except only one case report of perianal infection. Here, we describe the first case of pneumonia caused by the USA300 strain following pandemic influenza A (H1N1) in Korea. A 50-year-old man was admitted with fever and cough and chest radiograph showed pneumonic consolidation at the right lower lung zone. He received a ventilator support because of respiratory failure. PCR for pandemic influenza A (H1N1) in nasopharyngeal swab was positive, and culture of sputum and endotracheal aspirate grew MRSA. Typing of the isolate revealed that it was PVL-positive, ST 8-MRSA-SCCmec type IV. The analysis of the PFGE patterns showed that this isolate was the same pulsotype as the USA300 strain.
Community-Acquired Infections/*etiology/microbiology ; Humans ; Influenza A Virus, H1N1 Subtype ; Influenza, Human/*complications ; Male ; *Methicillin-Resistant Staphylococcus aureus/classification/isolation & purification ; Middle Aged ; Pneumonia, Staphylococcal/*etiology/microbiology ; Republic of Korea ; Staphylococcal Infections/*etiology/microbiology

BACKGROUND AND OBJECTIVES: Antibiotic prophylaxis of infective endocarditis is required before high-risk procedures in patient with high-risk heart diseases. Although guidelines for the prevention of infective endocarditis were proposed by the American Heart Association in 1997, compliance to these recommendations has not been evaluated in Korea. SUBJECTS AND METHODS: This was a retrospective, multicentered study in 8 Korean university hospitals. Patients with high-risk heart diseases, having undergone invasive dental procedures between Jan. 1, 2000 and Dec. 31, 2003, were enrolled. The medical and dental records of the patients were reviewed to evaluate whether the prophylaxis had been appropriate. RESULTS: Of the initial 4,912 patients, 184 that had been treated with invasive dental procedures (255 total episodes, mean 1.4/patient) were evaluated. The most common high-risk heart disease was a prosthetic heart valve (233 procedures), followed by a previous history of infective endocarditis (22 procedures), cyanotic heart diseases (5 procedures) and systemic pulmonic venous shunts (2 procedures). Antibiotic prophylaxis was performed in 231 procedures (90.8%). Amoxicillin was the most common antibiotic used for prophylaxis (88.6%); however, the adequate dosage (2 gm) was administered in only 56% of these cases. Therefore, the appropriate prophylaxis, according to the AHA recommendations, was performed in only 14.1% (36 procedures). The mean duration of prophylaxis and number of antibiotic doses were 2.40 days (2.40+/-2.44) and 7.97 doses (7.97+/-7.18), respectively. A previous history of infective endocarditis (p=0.03) and dental extraction (p<0.01) resulted in a longer duration of prophylaxis. CONCLUSION: Only 14.1% of the high risk group procedures were given appropriate antibiotic prophylaxis according to the AHA recommendations. These data suggest that protocol-based education of both doctors and patients is required for appropriate antimicrobial therapy during high-risk procedures for the prevention of infective endocarditis in patients with high-risk heart disease.
American Heart Association ; Amoxicillin ; Antibiotic Prophylaxis ; Compliance ; Dental Records ; Education ; Endocarditis* ; Heart Diseases ; Heart Valves ; Hospitals, University ; Humans ; Korea ; Retrospective Studies

The pneumonia severity index (PSI) and CURB-65 are widely used tools for the prediction of community-acquired pneumonia (CAP). This study was conducted to evaluate validation of severity scoring system including the PSI and CURB-65 scores of Korean CAP patients. In the prospective CAP cohort (participated in by 14 hospitals in Korea from January 2009 to September 2011), 883 patients aged over 18 yr were studied. The 30-day mortalities of all patients were calculated with their PSI index classes and CURB scores. The overall mortality rate was 4.5% (40/883). The mortality rates per CURB-65 score were as follows: score 0, 2.3% (6/260); score 1, 4.0% (12/300); score 2, 6.0% (13/216); score 3, 5.7% (5/88); score 4, 23.5% (4/17); and score 5, 0% (0/2). Mortality rate with PSI risk class were as follows: I, 2.3% (4/174); II, 2.7% (5/182); III, 2.3% (5/213); IV, 4.5% (11/245); and V, 21.7% (15/69). The subgroup mortality rate of Korean CAP patients varies based on the severity scores and CURB-65 is more valid for the lower scores, and PSI, for the higher scores. Thus, these variations must be considered when using PSI and CURB-65 for CAP in Korean patients.
Adolescent ; Adult ; Aged ; Aged, 80 and over ; Asian Continental Ancestry Group ; Cohort Studies ; Community-Acquired Infections/*mortality ; Female ; Humans ; Intensive Care Units ; Male ; Middle Aged ; Pneumonia/*mortality ; Prospective Studies ; Republic of Korea ; *Severity of Illness Index ; Young Adult