1.Asia-Pacific consensus on long-term and sequential therapy for osteoporosis
Ta-Wei TAI ; Hsuan-Yu CHEN ; Chien-An SHIH ; Chun-Feng HUANG ; Eugene MCCLOSKEY ; Joon-Kiong LEE ; Swan Sim YEAP ; Ching-Lung CHEUNG ; Natthinee CHARATCHAROENWITTHAYA ; Unnop JAISAMRARN ; Vilai KUPTNIRATSAIKUL ; Rong-Sen YANG ; Sung-Yen LIN ; Akira TAGUCHI ; Satoshi MORI ; Julie LI-YU ; Seng Bin ANG ; Ding-Cheng CHAN ; Wai Sin CHAN ; Hou NG ; Jung-Fu CHEN ; Shih-Te TU ; Hai-Hua CHUANG ; Yin-Fan CHANG ; Fang-Ping CHEN ; Keh-Sung TSAI ; Peter R. EBELING ; Fernando MARIN ; Francisco Javier Nistal RODRÍGUEZ ; Huipeng SHI ; Kyu Ri HWANG ; Kwang-Kyoun KIM ; Yoon-Sok CHUNG ; Ian R. REID ; Manju CHANDRAN ; Serge FERRARI ; E Michael LEWIECKI ; Fen Lee HEW ; Lan T. HO-PHAM ; Tuan Van NGUYEN ; Van Hy NGUYEN ; Sarath LEKAMWASAM ; Dipendra PANDEY ; Sanjay BHADADA ; Chung-Hwan CHEN ; Jawl-Shan HWANG ; Chih-Hsing WU
Osteoporosis and Sarcopenia 2024;10(1):3-10
Objectives:
This study aimed to present the Asia-Pacific consensus on long-term and sequential therapy for osteoporosis, offering evidence-based recommendations for the effective management of this chronic condition.The primary focus is on achieving optimal fracture prevention through a comprehensive, individualized approach.
Methods:
A panel of experts convened to develop consensus statements by synthesizing the current literature and leveraging clinical expertise. The review encompassed long-term anti-osteoporosis medication goals, first-line treatments for individuals at very high fracture risk, and the strategic integration of anabolic and anti resorptive agents in sequential therapy approaches.
Results:
The panelists reached a consensus on 12 statements. Key recommendations included advocating for anabolic agents as the first-line treatment for individuals at very high fracture risk and transitioning to anti resorptive agents following the completion of anabolic therapy. Anabolic therapy remains an option for in dividuals experiencing new fractures or persistent high fracture risk despite antiresorptive treatment. In cases of inadequate response, the consensus recommended considering a switch to more potent medications. The consensus also addressed the management of medication-related complications, proposing alternatives instead of discontinuation of treatment.
Conclusions
This consensus provides a comprehensive, cost-effective strategy for fracture prevention with an emphasis on shared decision-making and the incorporation of country-specific case management systems, such as fracture liaison services. It serves as a valuable guide for healthcare professionals in the Asia-Pacific region, contributing to the ongoing evolution of osteoporosis management.
2.Incidence and prognosis of olfactory and gustatory dysfunctions related to infection of SARS-CoV-2 Omicron strain: a national multi-center survey of 35 566 population.
Meng Fan LIU ; Rui Xia MA ; Xian Bao CAO ; Hua ZHANG ; Shui Hong ZHOU ; Wei Hong JIANG ; Yan JIANG ; Jing Wu SUN ; Qin Tai YANG ; Xue Zhong LI ; Ya Nan SUN ; Li SHI ; Min WANG ; Xi Cheng SONG ; Fu Quan CHEN ; Xiao Shu ZHANG ; Hong Quan WEI ; Shao Qing YU ; Dong Dong ZHU ; Luo BA ; Zhi Wei CAO ; Xu Ping XIAO ; Xin WEI ; Zhi Hong LIN ; Feng Hong CHEN ; Chun Guang SHAN ; Guang Ke WANG ; Jing YE ; Shen Hong QU ; Chang Qing ZHAO ; Zhen Lin WANG ; Hua Bin LI ; Feng LIU ; Xiao Bo CUI ; Sheng Nan YE ; Zheng LIU ; Yu XU ; Xiao CAI ; Wei HANG ; Ru Xin ZHANG ; Yu Lin ZHAO ; Guo Dong YU ; Guang Gang SHI ; Mei Ping LU ; Yang SHEN ; Yu Tong ZHAO ; Jia Hong PEI ; Shao Bing XIE ; Long Gang YU ; Ye Hai LIU ; Shao wei GU ; Yu Cheng YANG ; Lei CHENG ; Jian Feng LIU
Chinese Journal of Otorhinolaryngology Head and Neck Surgery 2023;58(6):579-588
Objective: This cross-sectional investigation aimed to determine the incidence, clinical characteristics, prognosis, and related risk factors of olfactory and gustatory dysfunctions related to infection with the SARS-CoV-2 Omicron strain in mainland China. Methods: Data of patients with SARS-CoV-2 from December 28, 2022, to February 21, 2023, were collected through online and offline questionnaires from 45 tertiary hospitals and one center for disease control and prevention in mainland China. The questionnaire included demographic information, previous health history, smoking and alcohol drinking, SARS-CoV-2 vaccination, olfactory and gustatory function before and after infection, other symptoms after infection, as well as the duration and improvement of olfactory and gustatory dysfunction. The self-reported olfactory and gustatory functions of patients were evaluated using the Olfactory VAS scale and Gustatory VAS scale. Results: A total of 35 566 valid questionnaires were obtained, revealing a high incidence of olfactory and taste dysfunctions related to infection with the SARS-CoV-2 Omicron strain (67.75%). Females(χ2=367.013, P<0.001) and young people(χ2=120.210, P<0.001) were more likely to develop these dysfunctions. Gender(OR=1.564, 95%CI: 1.487-1.645), SARS-CoV-2 vaccination status (OR=1.334, 95%CI: 1.164-1.530), oral health status (OR=0.881, 95%CI: 0.839-0.926), smoking history (OR=1.152, 95%CI=1.080-1.229), and drinking history (OR=0.854, 95%CI: 0.785-0.928) were correlated with the occurrence of olfactory and taste dysfunctions related to SARS-CoV-2(above P<0.001). 44.62% (4 391/9 840) of the patients who had not recovered their sense of smell and taste also suffered from nasal congestion, runny nose, and 32.62% (3 210/9 840) suffered from dry mouth and sore throat. The improvement of olfactory and taste functions was correlated with the persistence of accompanying symptoms(χ2=10.873, P=0.001). The average score of olfactory and taste VAS scale was 8.41 and 8.51 respectively before SARS-CoV-2 infection, but decreased to3.69 and 4.29 respectively after SARS-CoV-2 infection, and recovered to 5.83and 6.55 respectively at the time of the survey. The median duration of olfactory and gustatory dysfunctions was 15 days and 12 days, respectively, with 0.5% (121/24 096) of patients experiencing these dysfunctions for more than 28 days. The overall self-reported improvement rate of smell and taste dysfunctions was 59.16% (14 256/24 096). Gender(OR=0.893, 95%CI: 0.839-0.951), SARS-CoV-2 vaccination status (OR=1.334, 95%CI: 1.164-1.530), history of head and facial trauma(OR=1.180, 95%CI: 1.036-1.344, P=0.013), nose (OR=1.104, 95%CI: 1.042-1.171, P=0.001) and oral (OR=1.162, 95%CI: 1.096-1.233) health status, smoking history(OR=0.765, 95%CI: 0.709-0.825), and the persistence of accompanying symptoms (OR=0.359, 95%CI: 0.332-0.388) were correlated with the recovery of olfactory and taste dysfunctions related to SARS-CoV-2 (above P<0.001 except for the indicated values). Conclusion: The incidence of olfactory and taste dysfunctions related to infection with the SARS-CoV-2 Omicron strain is high in mainland China, with females and young people more likely to develop these dysfunctions. Active and effective intervention measures may be required for cases that persist for a long time. The recovery of olfactory and taste functions is influenced by several factors, including gender, SARS-CoV-2 vaccination status, history of head and facial trauma, nasal and oral health status, smoking history, and persistence of accompanying symptoms.
Female
;
Humans
;
Adolescent
;
SARS-CoV-2
;
Smell
;
COVID-19/complications*
;
Cross-Sectional Studies
;
COVID-19 Vaccines
;
Incidence
;
Olfaction Disorders/etiology*
;
Taste Disorders/etiology*
;
Prognosis
3.Analysis of prognostic factors of extranodal NK/T-cell lymphoma treated with pegaspargase/L-asparaginase: a multicenter retrospective study.
Zi Yuan SHEN ; Xi Cheng CHEN ; Hui Rong SHAN ; Tao JIA ; Wei Ying GU ; Fei WANG ; Qing Ling TENG ; Ling WANG ; Chun Ling WANG ; Yu Ye SHI ; Hao ZHANG ; Yu Qing MIAO ; Tai Gang ZHU ; Chun Yan JI ; Jing Jing YE ; Ming Zhi ZHANG ; Xu Dong ZHANG ; Liang WANG ; Kai Lin XU ; Wei SANG
Chinese Journal of Hematology 2023;44(8):642-648
Objective: To explore the prognostic factors of extracellular NK/T cell lymphoma (ENKTL) treated with pegaspargase/L-asparaginase. Methods: The clinical data of 656 ENKTL patients diagnosed at 11 medical centers in the Huaihai Lymphoma Working Group from March 2014 to April 2021 were retrospectively analyzed. The patients were randomly divided into two groups: a training set (460 cases) and a validation set (196 cases) at 7∶3, and the prognostic factors of the patients were analyzed. A prognostic scoring system was established, and the predictive performance of different models was compared. Results: Patients' median age was 46 (34, 57) years, with 456 males (69.5% ) and 561 nasal involvement (85.5% ). 203 patients (30.9% ) received a chemotherapy regimen based on L-asparaginase combined with anthracyclines, and the 5-year overall survival rate of patients treated with P-GEMOX regimen (pegaspargase+gemcitabine+oxaliplatin) was better than those treated with SMILE regimen (methotrexate+dexamethasone+cyclophosphamide+L-asparaginase+etoposide) (85.9% vs 63.8% ; P=0.004). The results of multivariate analysis showed that gender, CA stage, the Eastern Cooperative Oncology Group performance status (ECOG PS) score, HGB, and EB virus DNA were independent influencing factors for the prognosis of ENKTL patients (P<0.05). In this study, the predictive performance of the prognostic factors is superior to the international prognostic index, Korean prognostic index, and prognostic index of natural killer lymphoma. Conclusion: Gender, CA stage, ECOG PS score, HGB, and EB virus DNA are prognostic factors for ENKTL patients treated with pegaspargase/L-asparaginase.
Male
;
Humans
;
Middle Aged
;
Asparaginase/therapeutic use*
;
Prognosis
;
Retrospective Studies
;
Lymphoma, Extranodal NK-T-Cell/drug therapy*
;
Antineoplastic Combined Chemotherapy Protocols/therapeutic use*
;
Etoposide
;
Cyclophosphamide
;
Methotrexate/therapeutic use*
;
DNA/therapeutic use*
;
Treatment Outcome
4.Mesenchymal Stem Cell Secreted-Extracellular Vesicles are Involved in Chondrocyte Production and Reduce Adipogenesis during Stem Cell Differentiation
Yu-Chen TSAI ; Tai-Shan CHENG ; Hsiu-Jung LIAO ; Ming-Hsi CHUANG ; Hui-Ting CHEN ; Chun-Hung CHEN ; Kai-Ling ZHANG ; Chih-Hung CHANG ; Po-Cheng LIN ; Chi-Ying F. HUANG
Tissue Engineering and Regenerative Medicine 2022;19(6):1295-1310
BACKGROUND:
Extracellular vesicles (EVs) are derived from internal cellular compartments, and have potential as a diagnostic and therapeutic tool in degenerative disease associated with aging. Mesenchymal stem cells (MSCs) have become a promising tool for functional EVs production. This study investigated the efficacy of EVs and its effect on differentiation capacity.
METHODS:
The characteristics of MSCs were evaluated by flow cytometry and stem cell differentiation analysis, and a production mode of functional EVs was scaled from MSCs. The concentration and size of EVs were quantitated by Nanoparticle Tracking Analysis (NTA). Western blot analysis was used to assess the protein expression of exosomespecific markers. The effects of MSC-derived EVs were assessed by chondrogenic and adipogenic differentiation analyses and histological observation.
RESULTS
The range of the particle size of adipose-derived stem cells (ADSCs)- and Wharton’s jelly -MSCs-derived EVs were from 130 to 150 nm as measured by NTA, which showed positive expression of exosomal markers. The chondrogenic induction ability was weakened in the absence of EVs in vitro. Interestingly, after EV administration, type II collagen, a major component in the cartilage extracellular matrix, was upregulated compared to the EV-free condition.Moreover, EVs decreased the lipid accumulation rate during adipogenic induction.
5.Efficacy and safety of the long-acting fusion inhibitor albuvirtide in antiretroviral-experienced adults with human immunodeficiency virus-1: interim analysis of the randomized, controlled, phase 3, non-inferiority TALENT study.
Bin SU ; Cheng YAO ; Qing-Xia ZHAO ; Wei-Ping CAI ; Min WANG ; Hong-Zhou LU ; Yuan-Yuan CHEN ; Li LIU ; Hui WANG ; Yun HE ; Yu-Huang ZHENG ; Ling-Hua LI ; Jin-Feng CHEN ; Jian-Hua YU ; Biao ZHU ; Min ZHAO ; Yong-Tao SUN ; Wen-Hui LUN ; Wei XIA ; Li-Jun SUN ; Li-Li DAI ; Tai-Yi JIANG ; Mei-Xia WANG ; Qing-Shan ZHENG ; Hai-Yan PENG ; Yao WANG ; Rong-Jian LU ; Jian-Hua HU ; Hui XING ; Yi-Ming SHAO ; Dong XIE ; Tong ZHANG ; Fu-Jie ZHANG ; Hao WU
Chinese Medical Journal 2020;133(24):2919-2927
BACKGROUND:
Albuvirtide is a once-weekly injectable human immunodeficiency virus (HIV)-1 fusion inhibitor. We present interim data for a phase 3 trial assessing the safety and efficacy of albuvirtide plus lopinavir-ritonavir in HIV-1-infected adults already treated with antiretroviral drugs.
METHODS:
We carried out a 48-week, randomized, controlled, open-label non-inferiority trial at 12 sites in China. Adults on the World Health Organization (WHO)-recommended first-line treatment for >6 months with a plasma viral load >1000 copies/mL were enrolled and randomly assigned (1:1) to receive albuvirtide (once weekly) plus ritonavir-boosted lopinavir (ABT group) or the WHO-recommended second-line treatment (NRTI group). The primary endpoint was the proportion of patients with a plasma viral load below 50 copies/mL at 48 weeks. Non-inferiority was prespecified with a margin of 12%.
RESULTS:
At the time of analysis, week 24 data were available for 83 and 92 patients, and week 48 data were available for 46 and 50 patients in the albuvirtide and NRTI groups, respectively. At 48 weeks, 80.4% of patients in the ABT group and 66.0% of those in the NRTI group had HIV-1 RNA levels below 50 copies/mL, meeting the criteria for non-inferiority. For the per-protocol population, the superiority of albuvirtide over NRTI was demonstrated. The frequency of grade 3 to 4 adverse events was similar in the two groups; the most common adverse events were diarrhea, upper respiratory tract infections, and grade 3 to 4 increases in triglyceride concentration. Renal function was significantly more impaired at 12 weeks in the patients of the NRTI group who received tenofovir disoproxil fumarate than in those of the ABT group.
CONCLUSIONS:
The TALENT study is the first phase 3 trial of an injectable long-acting HIV drug. This interim analysis indicates that once-weekly albuvirtide in combination with ritonavir-boosted lopinavir is well tolerated and non-inferior to the WHO-recommended second-line regimen in patients with first-line treatment failure.
TRIAL REGISTRATION
ClinicalTrials.gov Identifier: NCT02369965; https://www.clinicaltrials.gov.Chinese Clinical Trial Registry No. ChiCTR-TRC-14004276; http://www.chictr.org.cn/enindex.aspx.
Adult
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Anti-HIV Agents/adverse effects*
;
Antiretroviral Therapy, Highly Active
;
China
;
Drug Therapy, Combination
;
HIV Infections/drug therapy*
;
HIV-1
;
Humans
;
Maleimides
;
Peptides
;
Ritonavir/therapeutic use*
;
Treatment Outcome
;
Viral Load
6.Distribution of Telocytes in Vital Organs of ApoE Mice.
Ying XU ; Hu TIAN ; Jian YU ; Jia Lin CHENG ; Yu Cheng ZHAO
Acta Academiae Medicinae Sinicae 2018;40(6):778-784
Objective To identify and verify the distribution of Telocytes derived from heterogeneous interstitial cells in the vital organs of ApoE mice.Methods Heart,kidney,and liver tissues were harvested from ApoE adult mice. Immunohistochemical assays were performed by using different immunobiological markers.Results Telocytes were found in these vital organs. The expressions of immunobiological markers differed among different organs. CD34,CD117,and CD28 were positively expressed in Telocytes in cardiac tissue;CD117 and plateled-derived growth factor-Α were negatively expressed in Telocytes in renal tissue;and CD117 and plateled-derived growth factor receptor-Α had negative expression in Telocytes in hepatic tissue. Furthermore,the distribution of Telocytes also differed in the same organ.Conclusions Telocytes exist in the vital organs of ApoE mice,as demonstrated by immunohistochemisty assay. The expressions of immunobiological markers differ among Telocytes in different organs.
Animals
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Antigens, CD34
;
metabolism
;
CD28 Antigens
;
metabolism
;
Kidney
;
cytology
;
Liver
;
cytology
;
Mice
;
Mice, Knockout, ApoE
;
Myocardium
;
cytology
;
Proto-Oncogene Proteins c-kit
;
metabolism
;
Telocytes
;
cytology
7.Comparison of diagnostic value of different doses multi-detector computed tomography urography in patients with urinary tract diseases
Zhuo HOU ; Tai-Feng SHI ; Shan-Zhong CHENG ; Feng CHENG
Chinese Journal of Clinical Medicine 2017;24(5):755-758
Objective:To explore the diagnostic value of low dose multi-detector computed tomography urography (CTU) in patients with urinary tract diseases.Methods:Sixty patients who were treated with CTU from January 2015 to December 2016 were included in this study.All patients were divided into three groups according to the random number method.Group Ⅰ (160 mA tube current),group Ⅱ (120 mA tube current) and group Ⅲ (80 mA tube current),the selected patients were taken to the corresponding tube current CTU.The diagnostic efficacy of three groups of uropathy was analyzed,and the three groups of CTU imaging results,iodine contrast agent dosage and radiation dose of the situation were compared.Results:The dose of iodine contrast agent and the effective dose of radiation in group Ⅲ were lower than those in group Ⅰ and group Ⅱ,and the dose of radiation and dose of iodine contrast agent in group Ⅱ were lower than those in group Ⅰ (P<0.05).The difference of CTU imaging scores between the three groups was not statistically significant.Conclusions:The diagnostic value of low-dose (80 mA tube current) CTU in urinary tract diseases is similar to the high-dose CTU,with the iodinated contrast agent dosage and effective dose of radiation reduced significantly,which is worth of clinical promotion.
8. Effect of automotive paint volatile on learning and memory ability and amino acid neurotransmitters in brain tissue of mice
Guo-Ying ZHENG ; Qing-Zhao LI ; Tai-Shan LI ; Mao-Jing LI ; Shui-Yuan CHENG
China Occupational Medicine 2016;43(01):26-29
OBJECTIVE: To explore the effect of automotive paint volatile on the learning and memory ability and its influence mechanism of the amino acid neurotransmitters in the brain tissue of mice. METHODS: Thirty specific pathogen free healthy male Kunming mice were randomly divided into control group,primer group and topcoat group,10 mice in each group. By static inhalation intoxication method,the primer group and topcoat group were exposed to corresponding paint volatile 600 and 580 mg / m3 respectively every day for 4 weeks,6 days per week,one time a day,2 hours each time.The mice of the control group were kept in the exposure cabinet without any paint volatile. After the exposure,the neuroethology examination was carried out by Morris water maze test. The amino acid levels of glutamic acid( GLU),aspartic acid( ASP),γ-aminobutyric acid( GABA) and glycine( GLY) in brain tissue of mice were detected by high performance liquid chromatography. RESULTS: Compared with the control group,the escape latency and the first crossing platform time were longer( P < 0. 05),target quadrant staying time and platform crossing times were decreased( P <0. 05),and the levels of GLU,ASP,GABA and GLY in brain tissues were decreased in the primer group and the topcoat group( P < 0. 05). There was no significant difference between the primer group and the topcoat group in the above indexes( P > 0. 05). CONCLUSION: Automotive paint volatiles exposure may lower the learning and memory abilities of mice,and could reduce the secretion of amino acid neurotransmitters in the brain tissue of mice.
9.Risk factors associated with postoperative hospital stay after pancreaticoduodenectomy: a retrospective study.
Yi-bin XIE ; Cheng-feng WANG ; Dong-bing ZHAO ; Yi SHAN ; Xiao-feng BAI ; Yue-min SUN ; Ying-tai CHEN ; Ping ZHAO ; Yan-tao TIAN
Chinese Medical Journal 2013;126(19):3685-3689
BACKGROUNDPostoperative hospital stay after pancreaticoduodenectomy (PD) is relatively longer than after other gastrointestinal operations. The aim of the current study was to investigate the risk factors associated with prolonged hospital stay after PD.
METHODSPatients who had PD at the Cancer Hospital of Chinese Academy of Medical Sciences between December 2008 and November 2012 were selected for this retrospective study. Clinical and pathological data were collected and analyzed. The primary outcome was postoperative length of stay. Normal discharge or recovery was defined as a postoperative hospital stay of no more than 10 days; otherwise it was defined as delayed discharge or recovery (including hospital death).
RESULTSA total of 152 patients were enrolled in the present study. Postoperative hospital stay was (19.7 ± 7.7) days (range 7-57). Of the 152 patients, 67 were discharged within the normal time and 85 had delayed discharge. Postoperative complications occurred in 62.5% (95/152), and the mortality rate was 3.29% (5/152). Multiple regression analysis showed that delayed discharge was significantly associated with postoperative complications (adjusted odds ratio (OR) 10.40, 95% confidence interval (CI) 3.58-30.22), age (adjusted OR 4.09, 95% CI 1.16-14.39), body mass index (BMI) (adjusted OR 4.40, 95% CI 1.19-16.23), surgical procedure (adjusted OR 26.14, 95% CI 4.94-153.19), blood transfusion (adjusted OR 7.68, 95% CI 2.09-28.27), and fluid input (adjusted OR 3.47, 95% CI 1.24-11.57).
CONCLUSIONSPostoperative complications increase the time to postoperative hospital discharge. The length of hospital stay after PD is also associated with age, BMI, blood transfusion, surgical procedure, and fluid input. Further studies with more patients are needed in future.
Adolescent ; Adult ; Aged ; Female ; Humans ; Length of Stay ; Logistic Models ; Male ; Middle Aged ; Pancreaticoduodenectomy ; Retrospective Studies
10.An unprecedented outbreak investigation for nosocomial and community-acquired legionellosis in Hong Kong.
Vincent Chi-Chung CHENG ; Samson Sai-Yin WONG ; Jonathan Hon-Kwan CHEN ; Jasper Fuk-Woo CHAN ; Kelvin Kai-Wang TO ; Rosana Wing-Shan POON ; Sally Cheuk-Ying WONG ; Kwok-Hung CHAN ; Josepha Wai-Ming TAI ; Pak-Leung HO ; Thomas Ho-Fai TSANG ; Kwok-Yung YUEN
Chinese Medical Journal 2012;125(23):4283-4290
BACKGROUNDThe environmental sources associated with community-acquired or nosocomial legionellosis were not always detectable in the mainland of China and Hong Kong, China. The objective of this study was to illustrate the control measures implemented for nosocomial and community outbreaks of legionellosis, and to understand the environmental distribution of legionella in the water system in Hong Kong, China.
METHODSWe investigated the environmental sources of two cases of legionellosis acquired in the hospital and the community by extensive outbreak investigation and sampling of the potable water system using culture and genetic testing at the respective premises.
RESULTSThe diagnosis of nosocomial legionellosis was suspected in a patient presenting with nosocomial pneumonia not responsive to multiple beta-lactam antibiotics with subsequent confirmation by Legionella pneumophila serogroup 1 antigenuria. High counts of Legionella pneumophila were detected in the potable water supply of the 70-year-old hospital building. Another patient on continuous ambulatory peritoneal dialysis presenting with acute community-acquired pneumonia and severe diarrhoea was positive for Legionella pneumophila serogroup 1 by polymerase chain reaction (PCR) testing on both sputum and nasopharyngeal aspirate despite negative antigenuria. Paradoxically the source of the second case was traced to the water system of a newly commissioned office building complex. No further cases were detected after shock hyperchlorination with or without superheating of the water systems. Subsequent legionella counts were drastically reduced. Point-of-care infection control by off-boiled or sterile water for mouth care and installation of water filter for showers in the hospital wards for immunocompromised patients was instituted. Territory wide investigation of the community potable water supply showed that 22.1% of the household water supply was positive at a mean legionella count of 108.56 CFU/ml (range 0.10 to 639.30 CFU/ml).
CONCLUSIONSPotable water systems are open systems which are inevitably colonized by bacterial biofilms containing Legionella species. High bacterial counts related to human cases may occur with stagnation of flow in both old or newly commissioned buildings. Vigilance against legionellosis is important in healthcare settings with dense population of highly susceptible hosts.
Aged ; Aged, 80 and over ; Biofilms ; Community-Acquired Infections ; diagnosis ; epidemiology ; Female ; Hong Kong ; epidemiology ; Humans ; Legionellosis ; diagnosis ; epidemiology ; Male ; Water Microbiology

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