Estimated incidence of influenza-virus-associated severe pneumonia in children in El Salvador, 2008–2010
Wilfrido Clara, Julio Armero, David Rodriguez, Celina de Lozano, Luis Bonilla, Percy Minaya, Rafael Chacón, Jorge Jara, Natalia Blanco, Marc-Alain Widdowson, Joseph Bresee, Xiyan Xu, Alexander Klimov, Eduardo Azziz-Baumgartner & Nivaldo Linares-Perez
Volume 90, Number 10, October 2012, 756-763
Table 3. Variables used to estimate the incidence of influenza-virus-associated severe pneumonia among children aged < 5 years living in the catchment area of San Juan de Dios Hospital, Santa Ana, El Salvador, 2008–2010
|Case patients identified at San Juan de Dios Hospital, no.||495||1367||692||2554|
|Case patients tested for respiratory viruses, no.||153||217||238||608|
|Case patients positive for influenza virus|
|Detected no., (%), (95% CI)||11 (7) (3–11)||21 (10) (6–14)||5 (2) (0.2–4)||37 (6) (4–8)|
|Census population aged < 5 years in catchment areaa||36 858||37 016||37 205||111 079|
|Census population that visits the sentinel site when ill, %b||63||63||63||63|
|Days when surveillance was performed, no., (%)c||343 (94)||340 (93)||339 (93)||1022 (93)|
|Adjusted census population (person–years)||21 827||21 688||21 798||65 081|
CI, confidence interval.
a Data are from the National VI Population and V Household Census 2007 of El Salvador.
b Data are from the sentinel site health-care service utilization survey performed in Santa Ana during November–December 2009.
c Percentages represent the proportion of days when surveillance was conducted in one year (365 days) or, for the last column, in three years (1095 days).