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Volume 11, Number 11—November 2005

Letter

Family Clustering of Avian Influenza A (H5N1)

Sonja J. Olsen*Comments to Author , Kumnuan Ungchusak†, Ly Sovann‡, Timothy M. Uyeki§, Scott F. Dowell*, Nancy J. Cox§, William Aldis¶, and Supamit Chunsuttiwat†
Author affiliations: *International Emerging Infections Program, Nonthaburi, Thailand; †Ministry of Public Health, Nonthaburi, Thailand; ‡Ministry of Health, Phnom Penh, Cambodia; §Centers for Disease Control and Prevention, Atlanta, Georgia, USA; ¶World Health Organization, Nonthaburi, Thailand

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Table

Family clusters of influenza A (H5N1) in Southeast Asia, January 2004–July 2005*

Cluster Onset of index case Country Age (y)/Sex Relation to index case H5N1 Onset Outcome
1 Dec 03 Vietnam (N) 12/F Self + Dec 25 D
30/F Mother + Jan 1 D
2 Dec 03 Vietnam (N) 5/M Self + Dec 29† D
7/F Sister NT NN D
3 Jan 04 Vietnam (N) 31/M Self NT Jan 7† D
30/F Sister + Jan 10 D
28/F Wife + Jan 10 R
23/F Sister + Jan 11 D
4 Jan 04 Thailand 6/M Self + Jan 8 D
33/F Mother NT Jan 8 D
5 Jul 04 Vietnam (S) 19/M Self NT Jul 23 D
22/F Cousin NT NN D
25/F Sister + Jul 31 D
6 Sep 04 Thailand 11/F Self NT Sep 2 D
26/F Mother + Sep 11 D
32/F Aunt + Sep 16 R
7 Dec 04 Vietnam (N) 46/M Self + Dec 26 D
42/M Brother + Jan 10† R
36/M Brother + Not ill Not ill
8 Jan 05 Vietnam (S) 17/M Self + Jan 10† D
22/F Sister NN NN Unknown‡
9 Jan 05 Vietnam (S) 35/F Self + Jan 14 D
13/F Daughter + Jan 20 D
10 Jan 05 Cambodia 14/M Self NT NN D
25/F Sister + Jan 21 D
11 Feb 05 Vietnam (N) 21/M Self + Feb 14 Unknown‡
14/F Sister + Feb 23 Unknown‡
80/M Grandfather + Not ill Not ill
12 Feb 05 Vietnam (N) 69/M Self + Feb 19 D
61/F Wife + Not ill Not ill
13 Mar 05 Vietnam 13/F Self NT Mar 9§ D
5/M Brother + Mar 12† R
Adult/F Aunt P NN Unknown‡
14 Mar 05 Vietnam (N) 39/M Self + Mar 22† Unknown‡
Adult/F Wife + Mar 22† Unknown‡
4 mo/NN Child + Mar 22† Unknown‡
3/NN Child + Mar 22† Unknown‡
10/NN Child + Mar 22† Unknown‡
15 Jul 05 Indonesia 8/F Self Jun 24 D
1/F Sister NT Jun 29 D
38/M Father + Jul 2 D

*D, respiratory death; N, north; NT, not tested; NN, not noted; P, pending; R, recovered; S, south.
†Date of hospitalization.
‡Had respiratory symptoms, was hospitalized (unknown for #13), and outcome was unknown.
§Date of death.
¶Serologically confirmed; classified as a probable case by the World Health Organization.

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