Influenza surveillance and incidence in a rural area in China during the 2009/2010 influenza pandemic. 2014

Ying Zhang, and Lin Li, and Xiaochun Dong, and Mei Kong, and Lu Gao, and Xiaojing Dong, and Wenti Xu
Department of Infectious Disease, Tianjin Centers for Disease Control and Prevention, Tianjin, China.

BACKGROUND Most influenza surveillance is based on data from urban sentinel hospitals; little is known about influenza activity in rural communities. We conducted influenza surveillance in a rural region of China with the aim of detecting influenza activity in the 2009/2010 influenza season. METHODS The study was conducted from October 2009 to March 2010. Real-time polymerase chain reaction was used to confirm influenza cases. Over-the-counter (OTC) drug sales were daily collected in drugstores and hospitals/clinics. Space-time scan statistics were used to identify clusters of ILI in community. The incidence rate of ILI/influenza was estimated on the basis of the number of ILI/influenza cases detected by the hospitals/clinics. RESULTS A total of 434 ILI cases (3.88% of all consultations) were reported; 64.71% of these cases were influenza A (H1N1) pdm09. The estimated incidence rate of ILI and influenza were 5.19/100 and 0.40/100, respectively. The numbers of ILI cases and OTC drug purchases in the previous 7 days were strongly correlated (Spearman rank correlation coefficient [r] = 0.620, P = 0.001). Four ILI outbreaks were detected by space-time permutation analysis. CONCLUSIONS This rural community surveillance detected influenza A (H1N1) pdm09 activity and outbreaks in the 2009/2010 influenza season and enabled estimation of the incidence rate of influenza. It also provides a scientific data for public health measures.

UI MeSH Term Description Entries
D007251 Influenza, Human An acute viral infection in humans involving the respiratory tract. It is marked by inflammation of the NASAL MUCOSA; the PHARYNX; and conjunctiva, and by headache and severe, often generalized, myalgia. Grippe,Human Flu,Human Influenza,Influenza in Humans,Influenza,Flu, Human,Human Influenzas,Influenza in Human,Influenzas,Influenzas, Human
D002681 China A country spanning from central Asia to the Pacific Ocean. Inner Mongolia,Manchuria,People's Republic of China,Sinkiang,Mainland China
D004366 Nonprescription Drugs Medicines that can be sold legally without a DRUG PRESCRIPTION. Drugs, Non-Prescription,Non-Prescription Drug,Nonprescription Drug,OTC Drug,OTC Drugs,Over-the-Counter Drug,Over-the-Counter Drugs,Patent Medicine,Patent Medicines,Drugs, Nonprescription,Medicines, Patent,Non-Prescription Drugs,Drug, Non-Prescription,Drug, Nonprescription,Drug, OTC,Drug, Over-the-Counter,Drugs, Non Prescription,Drugs, OTC,Drugs, Over-the-Counter,Medicine, Patent,Non Prescription Drug,Non Prescription Drugs,Over the Counter Drug,Over the Counter Drugs
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D012423 Rural Health The status of health in rural populations. Health, Rural
D012424 Rural Population The inhabitants of rural areas or of small towns classified as rural. Rural Residence,Rural Communities,Rural Spatial Distribution,Communities, Rural,Community, Rural,Distribution, Rural Spatial,Distributions, Rural Spatial,Population, Rural,Populations, Rural,Residence, Rural,Rural Community,Rural Populations,Rural Residences,Rural Spatial Distributions
D015994 Incidence The number of new cases of a given disease during a given period in a specified population. It also is used for the rate at which new events occur in a defined population. It is differentiated from PREVALENCE, which refers to all cases in the population at a given time. Attack Rate,Cumulative Incidence,Incidence Proportion,Incidence Rate,Person-time Rate,Secondary Attack Rate,Attack Rate, Secondary,Attack Rates,Cumulative Incidences,Incidence Proportions,Incidence Rates,Incidence, Cumulative,Incidences,Person time Rate,Person-time Rates,Proportion, Incidence,Rate, Attack,Rate, Incidence,Rate, Person-time,Rate, Secondary Attack,Secondary Attack Rates
D053118 Influenza A Virus, H1N1 Subtype A subtype of INFLUENZA A VIRUS with the surface proteins hemagglutinin 1 and neuraminidase 1. The H1N1 subtype was responsible for the Spanish flu pandemic of 1918 and 2009 H1N1 pandemic. H1N1 Influenza Virus,H1N1 Virus,H1N1 subtype,H1N1v Viruses,Influenza A (H1N1)pdm09,Influenza A (H1N1)pdm09 Virus,Influenza A H1N1, Variant Virus,Swine-Origin Influenza A H1N1 Virus,H1N1 Influenza Viruses,H1N1 Viruses,H1N1 subtypes,H1N1v Virus,Influenza Virus, H1N1,Swine Origin Influenza A H1N1 Virus,Virus, H1N1,Virus, H1N1 Influenza,Virus, H1N1v,subtype, H1N1
D058873 Pandemics Epidemics of infectious disease that have spread to many countries, often more than one continent, and usually affecting a large number of people. Pandemic
D018571 Sentinel Surveillance Monitoring of rate of occurrence of specific conditions to assess the stability or change in health levels of a population. It is also the study of disease rates in a specific cohort such as in a geographic area or population subgroup to estimate trends in a larger population. (From Last, Dictionary of Epidemiology, 2d ed) Sentinel Health Event,Biosurveillance Systems,Syndromic Surveillance,Biosurveillance System,Health Event, Sentinel,Surveillance, Sentinel,Surveillance, Syndromic

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