4 994 57.8 ARN-509 manufacturer Fatigue 3 0.3 10 0.6 Headache 1 0.1 3 0.2 Temperature > 38°C 3 0.3 9 0.5 Myalgia 33 2.9 119 6.9 Lymph node swelling 1 0.1 –   Mild local reaction 141 12.3 654 38.0 Strong local reaction 8 0.7 32 1.9 Total 1,144 100.0 1,720 100.0 * Multiple responses were possible Between 26 October 2009 and 2 March 2010, 245 HCWs with ILS (4.4%) were referred to the pH1N1 task force in the Emergency Department (Table 1). After performing a second test, one case remained indeterminate. The peak in ILS and pH1N1 infection in HCWs came in the 49th week of 2009. ILS occurred less often in pH1N1-vaccinated HCWs (OR 0.7; 95% CI 0.51–0.95), while the seasonal TIV showed no protective effect against ILS (OR 1.0; 95% CI 0.79–1.36). Gender was not associated with ILS (Table 4). Younger workers were more likely to present with ILS (OR for ≤30 years: 2.7; 95% CI 1.69–4.42). After adjusting for vaccination, nurses (OR 2.5; 95% CI 1.53–4.09) and physicians (OR 2.0; 95% CI 1.21–3.41) had a higher risk of developing ILS than administrators.

Table 4 Logistic regression for putative risk factors of influenza-like symptoms (ILS) Variable ILS OR 95% CI Neg. Pos. N (%) N (%) pH1N1 vaccination  No 3,690 (95.3) 182 (4.7) 1 –  Yes 1,657 (96.3) 63 (3.7) 0.7 0.51–0.95 Seasonal TIV 09/10  No 2,658 (95.9) 115 (4.1) 1 –  Yes 2,689 (95.4) 130 (4.6) 1.0 0.79–1.36 Gender          Female 3,856 (95.4) 186 (4.6) 1 –  Male 1,491 LGK-974 purchase (96.2) 59 (3.8) 0.9 0.64–1.18 Age (years)  ≤30 1,379 (93.7) 92 (6.3) 2.7 1.69–4.42  31–40 1,638 (95.0) 86 (5.0) 2.3 1.42–3.72  41–50 1,191 (96.4) 45 (3.6) 1.8 1.01–3.03  >50 1,139 (98.1) 22 (1.9) 1 – Profession  Nurses 1,854 (93.5) 128 (6.5) 2.5 1.53–4.09  Physicians 1,330 (95.5) 63 (4.5) 2.0 1.21–3.41  Auxiliary staff 1,239 (97.3) 34 (2.7) 1.1 0.63–1.95  Administration or others 924 (97.9) 20 (2.1) 1 – Out of the 97 pH1N1 infections, 91 (94%) occurred in

non-vaccinated HCWs and two (2%) in Adenosine HCWs vaccinated less than a week before the onset of symptoms. Overall, pH1N1 incidence was 1.7% of all HCWs, affecting 0.3% of those vaccinated and 2.4% of those not vaccinated (Table 5). The seasonal TIV did not protect against pH1N1 infection (OR 1.5; 95% CI 0.98–2.27) and neither did consecutive seasonal TIV in 2008 and 2009 (Table 1) (data not shown). Young HCWs were more often selleck screening library affected (OR for ≤30 years: 6.6; 95% CI 2.57–16.8, Table 5).