began to decrease, often coinciding with the new implementation of treatment to all cases of ILI (Figure A13-12).
At week 37 there were 538 confirmed deaths. The age distribution shows that most cases occurred in 40- to 59-year-old adults, but with importance given to the 0- to 9-year-olds for the years of life prematurely lost. However, it is emphasized that only the 20- to 39-year-old group shows female predominance due to the deaths of pregnant women (Figure A13-13). In the distribution of cases and deaths of pregnant women, it is observed that the number of deaths increased when treatment is only for disease mitigation; however, if treatment is implemented for all ILI cases, the number of deaths decreased (Figure A13-14).
Enhanced surveillance was implemented for cases and mortality from infection of the 2009-H1N1 influenza A virus in pregnant women through epidemiological clinical records. A “confirmed case” was defined as a case of acute respiratory illness or positive viral culture via real-time RT-PCR. From May 16, 2009, to July 31, 2009, 15 provinces reported 300 cases of 2009-H1N1 influenza A in pregnant women, 121 of which were confirmed and 85 (70.2 percent) of which were admitted to the hospital.
The incidence rate for 2009-H1N1 influenza A in pregnant women in the study period was 1.72 per 10,000, 1.28 per 10,000 versus the general population at risk (p 0.003). Pregnant women were twice as likely to be hospitalized