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Pre-symptomatic transmission of pandemic influenza H1N1 2009: investigation of a family cluster, Brazil

  • F. T. M. FREITAS (a1), A. P. S. CABRAL (a1), E. N. C. BARROS (a1), M. J. O. BURIGO (a2), R. D. PROCHNOW (a2), L. A. SILVA (a2), M. A. WIDDOWSON (a3) and J. SOBEL (a3)
  • DOI: http://dx.doi.org/10.1017/S0950268812001501
  • Published online: 16 July 2012
Abstract
SUMMARY

We investigated the first cluster of pandemic influenza H1N1 2009 reported in Brazil in May 2009. The index case-patient had travelled from the USA and had contact with 11 relatives before she presented with symptoms. We conducted face-to-face or telephone interviews with the index case-patient and all suspect cases. We found evidence of pre-symptomatic transmission of the virus to four of her contacts. This finding has public health implications because it indicates that viral transmission in communities may not be prevented solely by isolating symptomatic case-patients.

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Corresponding author
*Author for correspondence: F. T. M. Freitas, Secretaria de Vigilância em Saúde, Ministério da Saúde, Setor Comercial Sul, Quadra 4, Bloco A, 2° andar,70304-000, Brasilia, Brazil. (Email: felipetmf@gmail.com)
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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

2.F Carrat , Time lines of infection and disease in human influenza: a review of volunteer challenge studies. American Journal of Epidemiology 2008; 167: 775785.

3.Y Gu , Pandemic (H1N1) 2009 transmission during presymptomatic phase, Japan. Emerging Infectious Diseases 2011; 17: 17371739.

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Epidemiology & Infection
  • ISSN: 0950-2688
  • EISSN: 1469-4409
  • URL: /core/journals/epidemiology-and-infection
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