DES MOINES, Iowa (AP) — The Iowa Department of Health says cases of respiratory syncytial virus, commonly known as RSV, are on the rise in central Iowa. Department media relations specialist Amy Varcoe tells Des Moines television station KCCI that her infant has even had the virus. RSV doesn’t cause serious problems for older children and adults, but it can cause life-threatening respiratory infections in some infants. For children under a year, it’s the most common cause of pneumonia and an inflammation of the small airways.