In this analysis, eight countries were classified at the initiation interval (Brazil,[8] China,[9] Cuba,[7] Hungary,[10] India,[11] Ireland,[12] Norway,[13] and Philippines[14]); eight countries at the acceleration interval (Argentina,[15] Chile,[16] Greece,[17] New Zealand,[18] Panama,[19] Spain,[20] Thailand,[21] and UK[22]); and six countries at the peak-transmission interval (Australia,[23]
Canada,[24] Dominican Republic,[25, 26] Indonesia,[27] Mexico,[28] and the United States[29]). Chi-square or Fisher’s exact test was used as appropriate (SAS v9.2). Analysis of variance (anova) was used to assess the association between pandemic interval[5] in the exposure country and the identification of sentinel travelers with H1N1pdm09. A p selleck inhibitor value of <0.05 was considered statistically significant. An increase in the number of unspecified respiratory illnesses reported in GeoSentinel was observed during Epigenetic inhibitor nmr the early 2009 pandemic compared with data on respiratory illness reported from the same period in 2008 (Figure 2). Distribution of our laboratory-confirmed H1N1pdm09 cases coincided with the peak of respiratory illnesses documented from the week of April 26, 2009, through the end of June 2009.[7] Among the 203 (189 confirmed; 14 probable) H1N1pdm09
case-travelers identified, 56% were male; a majority, 60%, traveled for tourism; 20% traveled for business; and 86% were 10 to 44 years of age (Table 1). We compared H1N1pdm09 case-travelers with travelers in the GeoSentinel database with non-H1N1pdm09 unspecified respiratory illnesses or with nonrespiratory
Forskolin illnesses during the same period. Overall, the age profile of the three groups was significantly different (p < 0.0001; χ2). Paralleling age profiles in population-based studies[30] only 13% of our H1N1pdm09 case-travelers were older than 45 years, while 32% of our travelers with non-H1N1pdm09 unspecified respiratory illnesses and 29% of our travelers with nonrespiratory illnesses were in the above 45 years cohort. A higher proportion of H1N1pdm09 case-travelers were hospitalized (75%) compared with those with non-H1N1pdm09 unspecified respiratory illnesses (40%) and those with non-respiratory illnesses (13%) (p < 0.0001; χ2). H1N1pdm09 case-travelers self-declared having sought pre-travel medical advice from a medical provider less often (8%) than travelers with non-H1N1pdm09 unspecified respiratory illnesses (24%), and less often than travelers with nonrespiratory illnesses (43%) (p < 0.0001; χ2). Month-by-month clinic visit dates for 187 case-travelers were ascertained for 22 exposure countries (Table 2); 92% occurred from May to July 2009. The United States was the most frequently identified exposure countries (starting in May 2009), followed by Australia, the Philippines, UK, and Thailand.
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