The predisposing factors for a higher probability of adverse outcome during hospitalization were broadly similar to those found in other studies. 16, 21 In one international series of patients with community-acquired pneumonia, male sex and obesity were predictors of mortality, although we did not find similar results. 15 We found a significant association between reductions in ICU admission/death and the administration of neuraminidase inhibitors within the first 48 h after the onset of symptoms, similarly to the findings of Jain et al. 4 and other studies. 6, 7 In these reports none of the pregnant women who died had taken neuraminidase inhibitors within the first two days after the onset of illness.