TY - JOUR T1 - Online-only: Public health extras: News roundup on flu surveillance in schools, organic poultry farms and the link between physical activity and academic performance JF - The Nation's Health JO - Nations Health SP - E4 LP - E4 VL - 42 IS - 1 AU - Donya Currie Y1 - 2012/02/01 UR - http://www.thenationshealth.org/content/42/1/E4.abstract N2 - A system in which schools in Pennsylvania reported daily absenteeism and data on visits to the school nurse for influenza-like illness is a reliable device, but more research needs to be done, according to a study in the November issue of APHA’s American Journal of Public Health. ER -