Before the fall of 2022, most people were not thinking much about respiratory syncytial virus (RSV), even though most children get the illness by age 2, and even adults get the disease. But a remarkable surge of RSV cases, coupled with a heavy flu season and ongoing COVID-19 infections, is creating a trifecta of respiratory diseases that is wreaking havoc and pushing hospitals to the limit, and EMTs are seeing an uptick in calls concerning those facing serious symptoms.