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Influenza Other Respir Viruses. 2014 May;8(3):353-9. doi: 10.1111/irv.12240. Epub 2014 Feb 10.

Assessing the impact of public health interventions on the transmission of pandemic H1N1 influenza a virus aboard a Peruvian navy ship.

Author information

1
US Naval Medical Research Unit No. 6, Lima, Peru.

Abstract

BACKGROUND:

Limited data exist on transmission dynamics and effectiveness of control measures for influenza in confined settings.

OBJECTIVES:

To investigate the transmission dynamics of a 2009 pandemic H1N1 influenza A outbreak aboard a Peruvian Navy ship and quantify the effectiveness of the implemented control measures.

METHODS:

We used surveillance data and a simple stochastic epidemic model to characterize and evaluate the effectiveness of control interventions implemented during an outbreak of 2009 pandemic H1N1 influenza A aboard a Peruvian Navy ship.

RESULTS:

The serological attack rate for the outbreak was 49·1%, with younger cadets and low-ranking officers at greater risk of infection than older, higher-ranking officers. Our transmission model yielded a good fit to the daily time series of new influenza cases by date of symptom onset. We estimated a reduction of 54·4% in the reproduction number during the period of intense control interventions.

CONCLUSION:

Our results indicate that the patient isolation strategy and other control measures put in place during the outbreak reduced the infectiousness of isolated individuals by 86·7%. Our findings support that early implementation of control interventions can limit the spread of influenza epidemics in confined settings.

KEYWORDS:

Disease outbreak; Peru; influenza; military personnel; ships; transmission

PMID:
24506160
PMCID:
PMC4181484
DOI:
10.1111/irv.12240
[Indexed for MEDLINE]
Free PMC Article

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