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Volume 16, Number 8—August 2010

Dispatch

Pandemic (H1N1) 2009 Surveillance in Marginalized Populations, Tijuana, Mexico

Timothy C. RodwellComments to Author , Angela M. Robertson, Norma Aguirre, Alicia Vera, Christy M. Anderson, Remedios Lozada, Lwbba Chait, Robert T. Schooley, Xing-quan Zhang, and Steffanie A. Strathdee
Author affiliations: University of California, San Diego, California, USA (T.C. Rodwell, A.M. Robertson, N. Aguirre, A. Vera, C.M. Anderson, L. Chait, R.T. Schooley, X.-Q. Zhang, S.A. Strathdee); Patronato Pro-COMUSIDA, Tijuana, México (R. Lozada)

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Table

Univariate comparisons of 303 persons screened for pandemic (H1N1) 2009 virus in Tijuana, Mexico, May 1–November 20, 2009*

Variable Recruits not meeting inclusion criteria, 
n = 260 Suspected case-patients negative for influenza A/B,† n = 36 Suspected case-patients positive for influenza A/B,† n = 7
Age, y 35 (29–43) 34.5 (31.5–42.5) 28 (6–48)
Male sex 162 (63.3) 20 (55.6) 3 (42.9)
Heard about “swine flu” epidemic before screening 228 (87.7) 30 (90.9) 6 (85.7)
Subjective fever 14 (5.4) 13 (37.1) 7 (100)
Objective fever, oral temperature, °C 36.5 (36.2–36.8) 37.1 (36.6–37.5) 37.9 (37–38.3)
Cough 27 (10.4) 15 (42.9) 6 (85.7)
Sore throat 16 (6.2) 18 (51.4) 5 (71.4)
Severe headache 40 (15.4) 23 (65.7) 4 (57.1)
Joint aches 16 (6.2) 16 (47.1) 5 (71.4)
Muscle aches 18 (6.9) 18 (52.9) 5 (71.4)
Severe fatigue 23 (8.9) 17 (48.6) 5 (71.4)
Diarrhea 12 (4.6) 9 (25.7) 0
Vomiting 10 (3.9) 5 (14.3) 0
Traveled outside Tijuana since symptoms started 10 (3.9) 7 (20.0) 3 (42.9)
Contact with possible “swine flu” case in past 2 wks 6 (2.3) 11 (31.4) 4 (57.1)
Ever received influenza vaccination 13 (5.0) 5 (14.3) 6 (85.7)
Heard about “swine flu” from friends 74 (32.5) 11 (37.9) 5 (83.3)
Heard about “swine flu” from family 22 (9.6) 7 (24.1) 4 (66.7)
Heard about “swine flu” from co-workers 14 (6.1) 7 (24.1) 1 (16.7)
Heard about “swine flu” from newspaper 33 (14.5) 3 (10.3) 2 (33.3)
Heard about “swine flu” from radio 80 (35.1) 12 (41.4) 6 (100.0)
Heard about “swine flu” from television 182 (79.8) 23 (79.3) 6 (100.0)
>3 alcoholic drinks/d‡ 5 (14.7) 0
Injection drug user‡ 16 (45.7) 0
In jail 2 weeks before onset of symptoms‡ 2 (5.7) 0
Would be vaccinated for “swine flu” ‡ 36 (100.0) 7 (100.0)
Prefer to be vaccinated at hospital‡ 25 (71.4) 5 (71.4)
Prefer to be vaccinated at clinic‡ 1 (2.9) 0
Prefer to be vaccinated at PrevenCasa/Casita‡ 5 (14.3) 3 (42.9)
Prefer to be vaccinated at mobile clinic ‡ 0 0

*Values are no. (%) except for age and objective fever, which are median (interquartile range).
†By rapid influenza testing.
‡Only pandemic (H1N1) 2009 suspected case-patients (n = 43) were asked these questions.

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