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Live poultry market closure and avian influenza A (H7N9) infection in cities of China, 2013-2017: an ecological study.
Chen, Ying; Cheng, Jian; Xu, Zhiwei; Hu, Wenbiao; Lu, Jiahai.
  • Chen Y; School of Public Health, Key Laboratory of Tropical Diseases Control of Ministry of Education, One Health Center of Excellence for Research &Training, Sun Yat-sen University, Guangzhou, China.
  • Cheng J; School of Public Health and Social Work, Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia.
  • Xu Z; School of Public Health and Social Work, Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia.
  • Hu W; School of Public Health and Social Work, Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia.
  • Lu J; School of Public Health and Social Work, Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Australia.
BMC Infect Dis ; 20(1): 369, 2020 May 24.
Article in English | MEDLINE | ID: covidwho-343360
Semantic information from SemMedBD (by NLM)
1. Influenza A PROCESS_OF Aves
Subject
Influenza A
Predicate
PROCESS_OF
Object
Aves
2. Interventional procedure PREVENTS Influenza A
Subject
Interventional procedure
Predicate
PREVENTS
Object
Influenza A
3. Influenza A PROCESS_OF Aves
Subject
Influenza A
Predicate
PROCESS_OF
Object
Aves
4. Interventional procedure PREVENTS Influenza A
Subject
Interventional procedure
Predicate
PREVENTS
Object
Influenza A
ABSTRACT

BACKGROUND:

Previous studies have proven that the closure of live poultry markets (LPMs) was an effective intervention to reduce human risk of avian influenza A (H7N9) infection, but evidence is limited on the impact of scale and duration of LPMs closure on the transmission of H7N9.

METHOD:

Five cities (i.e., Shanghai, Suzhou, Shenzhen, Guangzhou and Hangzhou) with the largest number of H7N9 cases in mainland China from 2013 to 2017 were selected in this study. Data on laboratory-confirmed H7N9 human cases in those five cities were obtained from the Chinese National Influenza Centre. The detailed information of LPMs closure (i.e., area and duration) was obtained from the Ministry of Agriculture. We used a generalized linear model with a Poisson link to estimate the effect of LPMs closure, reported as relative risk reduction (RRR). We used classification and regression trees (CARTs) model to select and quantify the dominant factor of H7N9 infection.

RESULTS:

All five cities implemented the LPMs closure, and the risk of H7N9 infection decreased significantly after LPMs closure with RRR ranging from 0.80 to 0.93. Respectively, a long-term LPMs closure for 10-13 weeks elicited a sustained and highly significant risk reduction of H7N9 infection (RRR = 0.98). Short-time LPMs closure with 2 weeks in every epidemic did not reduce the risk of H7N9 infection (p > 0.05). Partially closed LPMs in some suburbs contributed only 35% for reduction rate (RRR = 0.35). Shenzhen implemented partial closure for first 3 epidemics (p > 0.05) and all closure in the latest 2 epidemic waves (RRR = 0.64).

CONCLUSION:

Our findings suggest that LPMs all closure in whole city can be a highly effective measure comparing with partial closure (i.e. only urban closure, suburb and rural remain open). Extend the duration of closure and consider permanently closing the LPMs will help improve the control effect. The effect of LPMs closure seems greater than that of meteorology on H7N9 transmission.
Subject(s)
Keywords

Full text: Available Collection: International databases Database: MEDLINE Main subject: Poultry / Influenza, Human / Epidemics / Influenza A Virus, H7N9 Subtype / Influenza in Birds Type of study: Observational study / Prognostic study Limits: Animals / Humans Country/Region as subject: Asia Language: English Journal: BMC Infect Dis Journal subject: Communicable Diseases Year: 2020 Document Type: Article Affiliation country: S12879-020-05091-7

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Poultry / Influenza, Human / Epidemics / Influenza A Virus, H7N9 Subtype / Influenza in Birds Type of study: Observational study / Prognostic study Limits: Animals / Humans Country/Region as subject: Asia Language: English Journal: BMC Infect Dis Journal subject: Communicable Diseases Year: 2020 Document Type: Article Affiliation country: S12879-020-05091-7