A prolonged multispecies outbreak of IMP-6 carbapenemase-producing Enterobacterales due to horizontal transmission of the IncN plasmid.

A multispecies outbreak of IMP-6 carbapenemase-producing Enterobacterales (IMP-6-CPE) occurred at an acute care hospital in Japan. This study was conducted to understand the mechanisms of IMP-6-CPE transmission by pulsed-field gel electrophoresis (PFGE), multilocus sequence typing and whole-genome sequencing (WGS), and identify risk factors for IMP-6-CPE acquisition in patients who underwent abdominal surgery. Between July 2013 and March 2014, 22 hospitalized patients infected or colonized with IMP-6-CPE (Escherichia coli [n = 8], Klebsiella oxytoca [n = 5], Enterobacter cloacae [n = 5], Klebsiella pneumoniae [n = 3] and Klebsiella aerogenes [n = 1]) were identified. There were diverse PFGE profiles and sequence types (STs) in most of the species except for K. oxytoca. All isolates of K. oxytoca belonged to ST29 with similar PFGE profiles, suggesting their clonal transmission. Plasmid analysis by WGS revealed that all 22 isolates but one shared a ca. 50-kb IncN plasmid backbone with blaIMP-6 suggesting interspecies gene transmission, and typing of plasmids explained epidemiological links among cases. A case-control study showed pancreatoduodenectomy, changing drains in fluoroscopy room, continuous peritoneal lavage and enteric fistula were associated with IMP-6-CPE acquisition among the patients. Plasmid analysis of isolates in an outbreak of IMP-6-CPE suggested interspecies gene transmission and helped to clarify hidden epidemiological links between cases.

Ten-Year Surveillance of Measles Virus from 2007-2016 in Osaka City, Japan.

Measles is a highly contagious infection caused by the measles virus (MV). This study performed long-term surveillance in order to survey the prevalence of MV. A total of 417 patients diagnosed with or suspected of having measles were tested for MV between January 2007 and December 2016 in Osaka City, Japan. Reverse transcription-polymerase chain reaction-based testing of clinical specimens showed that 54 patients (12.9%) were MV-positive. An MV epidemic occurred in 2007, in which all detected MV strains were genotype D5, an epidemic strain in Japan at that time. The detected wild-type MV strains in sporadic or outbreak-associated cases since 2011 included genotypes D4, D8, B3, and H1. Three vaccine strains (all genotype A) were also detected. Children ＜10 years of age accounted for 90.0% of the MV-positive patients in 2007. In contrast, adults (≥ 20 years of age) accounted for the majority of MV-positive cases since 2011, as follows: 100%, 50%, 71.4%, 100%, and 87.5% of cases in 2011, 2013, 2014, 2015, and 2016, respectively. The recent high rate of two-dose MV vaccination coverage among children in Japan may have contributed to the reduced risk of MV infection and onset of measles in young persons.

Impact of Coxsackievirus A6 emergence on hand, foot, and mouth disease epidemic in Osaka City, Japan.

Hand, foot, and mouth disease (HFMD) is an acute febrile illness characterized by fever; sore throat; and vesicular eruptions on the hands, feet, and oral mucosa. Until 2010, HFMD was predominantly associated with enterovirus (EV) A71 and coxsackievirus (CV) A16 in Japan. In 2011, CV-A6 emerged as a primary causative agent, causing the largest HFMD epidemic in Japan since 1981. Since then, CV-A6 has caused large HFMD epidemics every 2 years. The phylogenetic analysis of complete Viral Protein 1 (VP1) sequences revealed that most CV-A6 strains detected from 2011 to 2015 in Osaka City were classified into a different clade compared with CV-A6 strains detected from 1999 until 2009. The majority of CV-A6 strains detected in 2011 and most CV-A6 strains detected from 2013 to 2015 were mainly divided into two distinct genetic groups. Each epidemic strain carried unique amino acid substitutions in the presumed DE, EF, and GH loops of the VP1 protein that is exposed on the surface of the virion. There is a possibility that the appearance of substitutions on the surface of the virion and an accumulation of a susceptible population are significant factors in recent HFMD epidemics.

[TREATMENT SUPPORT AND TREATMENT QUTCOMES OF PULMONARY TUBERCULOSIS IN PATIENTS WITH HIV INFECTION IN OSAKA CITY].

[Objective] To contribute to countermeasures against pulmonary tuberculosis in patients with HIV infection through analyzing and evaluating its treatment outcomes and patient management. [Methods] The 'subjects were pulmonary tuberculosis patients newly registered between 2008 and 2014 in whom concomitant HIV infection was detected. For the control, sex- and generation-matched pulmonary tuberculosis patients newly registered in Osaka City -between 2012 and 2014 were adopted. On analysis, the X² test and Fisher's exact test were used, and a significance level below 5% was regarded as significant. [Results] 1) There were 25 pulmonary tuberculosis patients complicated by HIV. All were male -and the mean age was 43.2 years old. 2) The sputum smear positivity rate was 76.0% in the pulmonary tuberculosis patients complicated by HIV and 50.8 % in 250 control pulmonary tuberculosis patients, showing a significantly higher rate in the former. 3) Risk factors for the discontinuation of medication for tuberculosis: In the patients complicated by HIV, the follow- ing risks of the discontinuation of medication were noted in the order of a decreasing frequency: 'Lack of medication helpers' in 68.0%, 'Side effects' in 48.0%, 'Financial prob- lems' in 32.0%, and 'Liver damage' in 28.0%. Those in the control pulmonary tuberculosis patients were 33.2%, 22.8 %, 16.0%, and 11.6%, respectively, showing a significant difference in each factor. 4) The DOTS executing rates were 68.0% and 94.8% in the patients complicated by HIV and control patients, respectively, showing that it was significantly lower in the patients complicated by HIV. On comparison of the treatment outcomes excluding died, on treatment, transferred out, not evaluated, treatment succeeded in 72.7% in the patients complicated by HIV and 92.9% in the control patients, showing a significantly lower success rate in the patients complicated by HIV. The numbers of risk factors of discon- tinuation in. 16 and 6 patients complicated by HIV in whom treatment succeeded and treatment failed/defaulted were 3.8 and 2.8, respectively, showing that the number was higher in patients with successful treatment, and the DOTS execution rates were 75.0% and 33.3%, respectively, showing a higher rate in the successful treatment cases. [Conclusion] The treatment outcome was significantly poorer in pulmonary tuberculosis patients complicated by HIV than in the control pulmonary tuberculosis patients. More risk factors for the discontinuation of medication were observed and the DOTS execution rate was lower in the patients complicated by HIV, suggesting that risk assess- fient for the discontinuation of medication should be appro- priately performed, and support for medication should be strengthened.

The 2014 measles outbreak in Osaka An epidemiological study for the elimination of measles.

OBJECTIVES: To examine and analyze the spread of measles in Osaka in 2014 and determine effective measures to prevent such occurrences. METHODS: We analyzed 47 cases of measles reported in Osaka, including one measles patient living in another prefecture where there was an outbreak. We focused on age distribution, the number of patients reported each week, estimated infection routes, history of measles vaccination, detection of viruses, and number of days it took to report the case after the onset of measles. RESULTS: Patients aged 20-39 years accounted for 24 cases (51.1%). The number of patients reported started from 2nd week with relatively broad peak to 27(th) week, and the measles epidemic was brought under control in the 47(th) week. Among the 47 cases, no source could be identified in 16 cases (34.0%). Household exposure was the main cause of the infection (25.5%), followed by imported cases (21.3%). Eighty-three percent of the overall patients had not received a measles vaccination at all or it was unclear whether they previously had been vaccinated. Genotype B3, H1, and D8 were detected in our patients and these genotypes originated overseas. It took significantly more days, from the onset of measles, for the case to be reported in patients aged 15 years and over compared with those aged under 15 years (P=0.001). CONCLUSION: For eradicating measles in Osaka, it is important to raise awareness about this issue among medical institutions, especially institutions for adults, in order for them to report cases as soon as possible, upon discovery in their patients. In addition, "catch-up" supplementary immunizations are effective for all people, including adults who are susceptible to measles.