Seasonal Patterns of Legionellosis in Saitama, 2005^|^ndash;2009

Ozeki, Yukie; Yamada, Fumiya; Saito, Akinobu; Kishimoto, Tsuyoshi; Tanno, Sakiko; Nakamura, Yosikazu

doi:10.7883/yoken.65.330

Cited by 9 publications

(8 citation statements)

References 11 publications

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“…Of the 3,076 patients, 2,503 were males (81.4%) and 573 were females (18.6%). During the period, the number of males affected by the diseases was higher than that of females [9]. …”

Section: Resultsmentioning

confidence: 99%

“…This is remarkable, according to an example in the USA, among cases identified during 2011 - 2013, 79% occurred in persons aged 50 years or older [3]. In addition, the affected patients from a total of 3,076 cases in Japan from 2005 to 2009 were predominantly 50 years old or older (90.8% of total cases) [9]. …”

Section: Resultsmentioning

confidence: 99%

“…During the period, reported cases in Korea increased markedly in June, peaked in September, and began decreasing in the end of November with the cool season. Meanwhile in Japan, reported cases increased from early summer until late autumn, which might be the result of flooding event in period [9, 10]. …”

Section: Resultsmentioning

confidence: 99%

“…Korea and Japan are geographically close to each other and share similar socio-cultural characteristics for the lifestyle. The special distribution of reported cases of LD is influenced by localgeography and topology, and at least in both countries, the incidences are associated with artificial aquatic environments for human health [1-6, 9, 10]. …”

Section: Introductionmentioning

confidence: 99%

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A Comparative Study of the Epidemiological Aspects of Legionnaires’ Disease: Outbreaks in Korea and Japan, 2010 - 2014

et al. 2017

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BackgroundIn the present study, we compared the epidemiological aspects of Legionnaire’ disease (LD) outbreaks in Korea and Japan by analyzing the current state from 2010 to 2014.MethodsThe following factors were analyzed: nationwide cumulative incidence rate (CIR) per 100,000 populations and case-fatality rate in percentage, epidemiological aspects (i.e., case related to gender), male to female morbidity ratio (MFMR), age, seasonality and habitat distribution of LD cases.ResultsIn total, there were 134 cases of LD with the CIR of 0.05 per 100,000 populations in Korea from 2010 to 2014. During the same period in Japan, there were 4,840 cases of LD with a CIR of 0.76 per 100,000 populations. The CIR in Japan was significantly higher than that in Korea. However, the case-fatality rates were at similar levels (3.0% vs. 5.9%). Moreover, LD affects both sexes differently, accounting for 2.05 and 4.41 of MFMR in Korea and Japan, respectively. In both countries, the incidence mainly occurred among people aged 40 years or older, and peaked in summer (37.3% vs. 33.7% of total cases). Significant differences were observed in the incidence of LD cases between the capital city and county areas in both two countries. These differences in LD risk factors reflect the different influences of reservoir/host with natural or artificial aquatic environments.ConclusionThis study provides a quantitative analysis of the epidemiological aspects and risk factors of LD outbreaks in Korea and Japan. We hope this study would be helpful for providing insight on effective future strategies to reduce LD outbreaks.

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“…Of the 3,076 patients, 2,503 were males (81.4%) and 573 were females (18.6%). During the period, the number of males affected by the diseases was higher than that of females [9]. …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Comparative Study of the Epidemiological Aspects of Legionnaires’ Disease: Outbreaks in Korea and Japan, 2010 - 2014

et al. 2017

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“…The frequencies of the isolates harboring the lag-1 gene were not significantly different between isolates from puddles and public baths (P Ͼ 0.05, 2 test). In Japan, the number of legionellosis cases peaked in July, the second half of the rainy season (32,33). To elucidate the possibility that splashed aerosols from puddles on a road, as well as public bath water, are a probable source of legionellosis, we need further investigation of the virulence of these strains by a combination of molecular typing profiles such as SBT, lag-1 allele typing, and monoclonal antibody subgrouping (9).…”

Section: Figmentioning

confidence: 99%

Close Genetic Relationship between Legionella pneumophila Serogroup 1 Isolates from Sputum Specimens and Puddles on Roads, as Determined by Sequence-Based Typing

Kanatani

Isobe

Kimata

et al. 2013

Appl Environ Microbiol

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bWe investigated the prevalence of Legionella species isolated from puddles on asphalt roads. In addition, we carried out sequence-based typing (SBT) analysis on the genetic relationship between L. pneumophila serogroup 1 (SG 1) isolates from puddles and from stock strains previously obtained from sputum specimens and public baths. Sixty-nine water samples were collected from puddles on roads at 6 fixed locations. Legionella species were detected in 33 samples (47.8%) regardless of season. Among the 325 isolates from puddles, strains of L. pneumophila SG 1, a major causative agent of Legionnaires' disease, were the most frequently isolated (n ‫؍‬ 62, 19.1%). Sixty-two isolates of L. pneumophila SG 1 from puddles were classified into 36 sequence types (STs) by SBT. ST120 and ST48 were identified as major STs. Environmental ST120 strains from puddles were found for the first time in this study. Among the 14 STs of the clinical isolates (n ‫؍‬ 19), 4 STs (n ‫؍‬ 6, 31.6%), including ST120, were also detected in isolates from puddles on roads, and the sources of infection in these cases remained unclear. The lag-1 gene, a tentative marker for clinical isolates, was prevalent in puddle isolates (61.3%). Our findings suggest that puddles on asphalt roads serve as potential reservoirs for L. pneumophila in the environment.

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Impact of household air pollution on human health: source identification and systematic management approach

Ahmed

Hossain

et al. 2019

SN Appl. Sci.

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Household air pollution (HAP) is one of the most important global environmental and public health issues. As a result of changes in air composition due to rapid industrialization and urbanization, air quality is deteriorating and outdoor pollution is increasing daily. Simultaneously, poor ventilation, microbial growth, tobacco smoke, solid fuel use, and different toxic chemicals are causing deterioration in household air quality, which contributes significantly to the global burden of disease. This paper reviews the available literature to examine the impact of HAP on human health, comprehensively identifies the sources of HAP, and synthesize management approaches to reducing the severity of HAP. The English language databases PubMed, Google Scholar, Web of Science, and Science Direct were searched using the key terms: HAP, particulate matter, health risks, public health, pollutant sources, burden of diseases, and management approach. Bibliographies of all relevant articles were also screened to find further useful articles. This review addresses all possible sources of HAP that are categorized as biological or chemical (organic and inorganic) and are associated with grave public health threats, such as lung function reduction, respiratory illness, asthma, pneumonia, tuberculosis, eye diseases, pregnancy complications, cardiovascular diseases, and cancer. Suggested approaches, including compliance with international guidelines and regulatory frameworks, pollutant source reduction methods, and fulfillment of international environmental laws, conventions, agreements, protocols, and treaties, can be effectively adopted to mitigate household air pollutants, reduce the global burden of disease, and promote household environments that support better human health. The sources of HAP and its health impacts should be considered in the development of future policies concerning reduction in all household air pollutants worldwide. Therefore, this review establishes the groundwork for future studies assessing the effectiveness of strategies aimed at creating sound household environments to promote better human health.

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Seasonal Patterns of Legionellosis in Saitama, 2005^|^ndash;2009

Cited by 9 publications

References 11 publications

A Comparative Study of the Epidemiological Aspects of Legionnaires’ Disease: Outbreaks in Korea and Japan, 2010 - 2014

A Comparative Study of the Epidemiological Aspects of Legionnaires’ Disease: Outbreaks in Korea and Japan, 2010 - 2014

Close Genetic Relationship between Legionella pneumophila Serogroup 1 Isolates from Sputum Specimens and Puddles on Roads, as Determined by Sequence-Based Typing

Impact of household air pollution on human health: source identification and systematic management approach

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