Denver Public Schools is putting out a dragnet for asthma--a lung disease that steals the breath of about 10 percent of children nationwide and up to nearly 19 percent in a few Denver schools. With $1.2 million in state funding, nurses and counselors are screening students for the disease's earliest signs. They're mailing surveys to parents and staffing back-to-school-night tables in search of children who cough at night or struggle to recover after a cold, and those who end up in emergency rooms, fighting for air. About 5,000 children in the district have asthma, the team estimates.