Skip to main content Accessibility help
×
Home

Estimate of 2009 H1N1 influenza cases in Shenzhen – the biggest migratory city in China

  • X. XIE (a1), S. Q. Y. LU (a1) (a2), J. Q. CHENG (a1), X. W. CHENG (a1), Z. H. XU (a3), J. MOU (a1), S. J. MEI (a1), D. F. KONG (a1), X. WANG (a1), Y. LI (a1), G. FELLMETH (a4) and H. W. MA (a1)...

Summary

The 2009 novel H1N1 influenza pandemic had a significant impact on Shenzhen's population with 2063 laboratory-confirmed human H1N1 cases and five deaths being reported. We used parameters from two population-based surveys and the Shenzhen Influenza Surveillance System to estimate the total number of H1N1 influenza infections in Shenzhen in the 2009 pandemic. The attack rate of influenza-like illness (ILI) in family households was 11·2% (95% CI 9·4–13·0), with 80·2% (95% CI 77·8–82·5) seeking medical care. The ILI attack rate in workers was 38·1% (95% CI 34·3–41·7) with 72·5% (95% CI 66·9–78·0) seeking medical care. The average H1N1 positive rate in individuals reporting ILI and testing by polymerase chain reaction was 22·7%. A total of 611 000–768 000 people, or 4·7–5·9% of the Shenzhen population, are estimated to have experienced H1N1 influenza. The estimated total number of cases of H1N1 is likely to be 330 times greater than the number of laboratory-confirmed cases.

  • View HTML
    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Estimate of 2009 H1N1 influenza cases in Shenzhen – the biggest migratory city in China
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Estimate of 2009 H1N1 influenza cases in Shenzhen – the biggest migratory city in China
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Estimate of 2009 H1N1 influenza cases in Shenzhen – the biggest migratory city in China
      Available formats
      ×

Copyright

Corresponding author

*Author for correspondence: Dr J. Q. Cheng, Jinquan, Shenzhen Center for Disease Control and Prevention, No. 8, Longyuan Road, Nanshan District, Shenzhen, 518055, Guangdong, P.R. China. (Email: jqchengcdc@gmail.com)

References

Hide All
1.Mou, J, et al. Health care utilisation amongst Shenzhen migrant workers: does being insured make a difference? BMC Health Services Research 2009; 9: 214.
2.Shenzhen Statistics Bureau. 2005 Shenzhen report of the national 1% population sampling survey. Shenzhen, Guangdong, China, 2005 (http://www.sztj.com/main/xxgk/tjsj/tjgb/pcgb/200605181682.shtml). Accessed 13 December 2009.
3.Shenzhen Government. Shenzhen Yearbook 2008. Shenzhen, Guangdong, China, 2008. (http://www.sztj.com/main/xxgk/tjsj/tjgb/gmjjhshfzgb/200903243520.shtml). Accessed 13 December 2009.
4.World Health Organization. Human infection with (pandemic) H1N1 2009: updated interim WHO guidance on global surveillance 2009. (http://www.who.int/csr/resources/publications/swineflu/interim_guidance/en/index.html). Accessed 23 March 2010.
5.World Health Organization. A practical guide for designing and conducting influenza disease burden studies, 2008 November (http://www.wpro.who.int/internet/resources.ashx/CSR/Publications/GuideforDesigningandConductingInfluenzaStudies.pdf). Accessed 10 November 2009.
6.Shenzhen Government. Shenzhen Migrant workers: safeguard and employment. Shenzhen, Guangdong, China, 2009 (http://www.szhrss.gov.cn/tjsj/zxtjxx/200910/t20091023_1214416_7374.htm). Accessed 25 June 2010.
7.Wilson, N, Baker, MG. The emerging influenza pandemic: estimating the case fatality ratio. Eurosurveillance 2009; 14.
8.Bootsma, MC, Ferguson, NM. The effect of public health measures on the 1918 influenza pandemic in U.S. cities. Proceedings of the National Academy of Sciences USA 2007; 104: 75887593.
9.Colizza, V, et al. Estimate of Novel Influenza A/H1N1 cases in Mexico at the early stage of the pandemic with a spatially structured epidemic model. PLoS Currents: Influenza 2009; RRN1129.
10.Reed, C, et al. Estimates of the prevalence of pandemic (H1N1) 2009, United States, April–July 2009. Emerging Infectious Diseases 2009; 15: 20042007.
11.Baker, MG, et al. Pandemic influenza A(H1N1)v in New Zealand: the experience from April to August 2009. Eurosurveillance 2009; 14.
12.Tuite, AR, et al. Estimated epidemiologic parameters and morbidity associated with pandemic H1N1 influenza. Canadian Medical Association Journal 2010; 182: 117.
13.Lipsitch, M, et al. How to maintain surveillance for novel influenza A H1N1 when there are too many cases to count. Lancet 2009; 374: 12091211.
14.Payne, L, et al. ‘Did you have flu last week?’ A telephone survey to estimate a point prevalence of influenza in the Swedish population. Eurosurveillance 2005; 10: 241244.

Keywords

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed