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Volume 21, Number 5—May 2015

Detecting Spread of Avian Influenza A(H7N9) Virus Beyond China

Alexander J. MillmanComments to Author , Fiona Havers, A. Danielle Iuliano, C. Todd Davis, Borann Sar, Ly Sovann, Savuth Chin, Andrew L. Corwin, Phengta Vongphrachanh, Bounlom Douangngeun, Kim A. Lindblade, Malinee Chittaganpitch, Viriya Kaewthong, James C. Kile, Hien T. Nguyen, Dong V. Pham, Ruben O. Donis, and Marc-Alain Widdowson
Author affiliations: Author affiliations: Centers for Disease Control and Prevention (CDC), Atlanta, Georgia, USA (A.J. Millman, F. Havers, A.D. Iuliano, C.T. Davis, R.C. Donis, M.-A. Widdowson); CDC, Phnom Penh, Cambodia (B. Sar); Ministry of Health, Phnom Penh (L. Sovan); National Institute of Public Health, Phnom Penh (S. Chin); CDC, Vientiane, Laos (A.L. Corwin); National Center for Laboratory Epidemiology, Vientiane (P. Vongphrachanh); Ministry of Agriculture and Forestry, Vientiane (B. Douangngeun); Thailand Ministry of Public Health–CDC Collaboration, Nonthaburi, Thailand (K.A. Lindblade); National Institute of Health, Nonthaburi (M. Chittaganpitch); Ministry of Agriculture and Cooperatives, Bangkok, Thailand (V. Kaewthong); CDC, Hanoi, Vietnam (J.C. Kile); Ministry of Health, Hanoi (H.T. Nguyen); Ministry of Agriculture and Rural Development, Hanoi (D.V. Pham)

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Table 2

Surveillance for SARI and ILI and passive surveillance for pneumonia for avian influenza in humans, 4 Southeast Asia countries, April 1, 2013–May 30, 2014*

Surveillance system No. illnesses meeting case definition Total no. samples tested A(H5N1), no. positive/no. tested A(H7N9), no. positive/no. tested
SARI 11,558 2,485 0/798 0/798
ILI 29,027 3,770 0/0 0/0
Passive surveillance for pneumonia†
SARI 1,025 0/106§ 0/106§
ILI 3,850 0/807 0/807
Passive surveillance for pneumonia 157 0/157 0/43
Event-based surveillance 18 outbreaks 162 0/69§ 0/69§
Surveillance for severe or fatal pneumonia
SARI 2,282 2,282 7/219 0/0
SARI 1,469 698 0/15 0/15
ILI 8,962 1,550 0/0 0/0

*ILI, influenza-like illness; SARI, severe acute respiratory infection.
†Severe viral pneumonia surveillance system.
‡Total number of illnesses meeting the case definition is unknown for ILI. For SARI, the number of illnesses meeting the case definition is unknown but believed to be close to 100% of persons sampled. Reporting to the passive pneumonia surveillance system is in accordance with physician discretion, and no clear case definition is applied.
§A(H5N1) and A(H7N9) testing is conducted only on specimens positive for influenza A virus.

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Page created: April 17, 2015
Page updated: April 17, 2015
Page reviewed: April 17, 2015
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