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Volume 16, Number 4—April 2010

Research

Household Transmission of Pandemic (H1N1) 2009, San Antonio, Texas, USA, April–May 2009

Oliver W. MorganComments to Author , Sharyn Parks, Trudi Shim, Patricia A. Blevins, Pauline M. Lucas, Roger Sanchez, Nancy Walea, Fleetwood Loustalot, Mark R. Duffy, Matthew J. Shim, Sandra Guerra, Fernando Guerra, Gwen Mills, Jennifer Verani, Bryan Alsip, Stephen Lindstrom, Bo Shu, Shannon Emery, Adam L. Cohen, Manoj Menon, Alicia M. Fry, Fatimah Dawood, Vincent P. Fonseca, and Sonja J. Olsen
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA (O.W. Morgan, S. Parks, F. Loustalot, J. Verani, S. Lindstrom, B. Shu, S. Emery, A.L. Cohen, M. Menon, A.M. Fry, F. Dawood, S.J. Olsen); Department of State Health Services, Austin, Texas, USA (S. Parks, T. Shim, N. Walea, S. Guerra, V.P. Fonseca); United States Air Force School of Aerospace Medicine, Brooks City-Base, Texas, USA (P.M. Lucas, M.R. Duffy, M.J. Shim); San Antonio Metropolitan Health District, San Antonio, Texas, USA (P.A. Blevins, R. Sanchez, F. Guerra, B. Alsip); Comal County Health Department, New Braunfels, Texas, USA (G. Mills)

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Table 1

Index and secondary household case-patients with ARI, ILI, or laboratory-confirmed pandemic (H1N1) 2009, Region 8, Texas, April–May, 2009*

Household Index case-patients
Secondary case-patients
Serial interval, d†
Date of onset Age, y Case definition Date of onset Age, y Case definition
A Apr 18 14‡ A, no subtype Apr 25 21 Pandemic (H1N1) 2009 7
B Apr 19 5 Pandemic (H1N1) 2009 Apr 21 9 Pandemic (H1N1) 2009 2
C Apr 22 18 Pandemic (H1N1) 2009 Apr 25 <1 Pandemic (H1N1) 2009 3
D Apr 26 1 Pandemic (H1N1) 2009 May 4 27 Pandemic (H1N1) 2009 2
E Apr 26 16 Pandemic (H1N1) 2009 Apr 27 51 Pandemic (H1N1) 2009 1
Apr 27 8 ILI 1
F Apr 27 <1 Pandemic (H1N1) 2009 Apr 29 22 Pandemic (H1N1) 2009 2
May 6 47 ARI 9
G Apr 27 16 Pandemic (H1N1) 2009 May 1 16 Pandemic (H1N1) 2009 4
May 1 14 Pandemic (H1N1) 2009 4
H Apr 29 6 Pandemic (H1N1) 2009 Apr 3 <1 Pandemic (H1N1) 2009 1
I May 3 33 Pandemic (H1N1) 2009 May 7 15 Pandemic (H1N1) 2009 4





May 8
14
Pandemic (H1N1) 2009
5
Subtotal no. case-patients 9 13 3 (19)
J Apr 20 17 Pandemic (H1N1) 2009 Apr 26 14 ARI 6
K Apr 24 71 Pandemic (H1N1) 2009 Apr 27 65 ILI 3
L Apr 25 16 Pandemic (H1N1) 2009 Apr 27 16 ILI 2
M Apr 25 12 Pandemic (H1N1) 2009 Apr 28 30 ARI 3
Apr 28 33 ARI 3
Apr 30 6 ARI 5
N Apr 26 30 Pandemic (H1N1) 2009 May 1 28 ARI 5
O Apr 27 33 Pandemic (H1N1) 2009 May 5 53 ARI 8
P Apr 28 25 Pandemic (H1N1) 2009 May 4 14 ILI 6
Q Apr 29 1 Pandemic (H1N1) 2009 May 1 21 ILI 2
May 2 2 ILI 3
R Apr 29 8 Pandemic (H1N1) 2009 May 3 44 ARI 4
S
May 1
6
Pandemic (H1N1) 2009

May 3
45
ILI
2
Subtotal no. case-patients 10 13 3 (18)
T Apr 17 11 ILI Apr 21 18 Pandemic (H1N1) 2009 4
U Apr 18 48 ILI Apr 26 10 Pandemic (H1N1) 2009 8
V Apr 23 53 ILI Apr 26 42 Pandemic (H1N1) 2009 3
W Apr 24 5 ILI Apr 29 <1 Pandemic (H1N1) 2009 5
X Apr 28 26 ILI May 2 7 Pandemic (H1N1) 2009 4





May 3
4
ILI
5
Subtotal no. case-patients

5



6
4.5 (38)
Total no. case-patients 24 32 4 (19)

*ARI, acute respiratory infection; ILI, influenza-like illness (fever measured or subjective and cough or sore throat).
†Median (range) number of days between symptom onset of the index and secondary case-patients.
‡The influenza virus from this person could not be subtyped, possibly because of the quality of the sample or the length of time from symptom onset to sample collection. We considered this case-patient to have been infected with pandemic (H1N1) 2009.

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