Abstract:
INTRODUCTION:Observational studies of influenza vaccine effectiveness often study persons seeking medical care for acute respiratory infection (ARI). We conducted a pilot study to determine if vaccine effectiveness could be estimated in the general population with a novel rolling cross-sectional survey sampling design and laboratory confirmation of influenza. METHODS:Cross-sectional samples were selected weekly from defined populations in Marshfield, Wisconsin and Monroe County, New York from January through April, 2011 (12 weeks). Persons were telephoned and asked about the occurrence of ARI in the past week. Nasal and throat swabs were obtained from consenting individuals with ARI and tested by real-time reverse transcription polymerase chain reaction (RT-PCR). Vaccine effectiveness (VE) was defined as (100×[1-OR]) for vaccination in a logistic regression model that adjusted for age, calendar week, and site. The comparison group included all study participants without RT-PCR confirmed influenza, including those who were not ill. RESULTS:Study personnel contacted 9537 (62%) of 15,303 persons sampled; the primary analysis included 5678 subjects. Of these, 193 (3%) reported an ARI and agreed to be tested for influenza; 13 (7%) were influenza positive. The adjusted effectiveness of the influenza vaccine was 1% (95% confidence limits -239-70%). CONCLUSIONS:The rolling cross-sectional design is methodologically feasible and may be useful as a complement to clinic-based VE studies. This pilot study did not have sufficient power to detect significant vaccine effectiveness during a mild influenza season, but this approach may facilitate rapid estimation of VE in a pandemic setting when normal patterns of health care utilization are disrupted.
journal_name
Vaccinejournal_title
Vaccineauthors
Donahue JG,Kieke BA,Szilagy PG,Blumkin AK,Hilgemann D,Flanders WD,Shay DK,Meece J,Gallivan S,Treanor J,Belongia EAdoi
10.1016/j.vaccine.2014.09.051subject
Has Abstractpub_date
2014-11-12 00:00:00pages
6440-4issue
48eissn
0264-410Xissn
1873-2518pii
S0264-410X(14)01319-Xjournal_volume
32pub_type
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