The positivity rate of subtypes of influenza virus has been rising continuously for four weeks.

On the 16th, the Chinese Center for Disease Control and Prevention released the situation of national sentinel surveillance of acute respiratory infectious diseases in the 15th week of 2026. The positive rate of detection for parainfluenza virus has been rising for four consecutive weeks, with the group of cases under 5 years old higher than other age groups. "Although parainfluenza virus and the well-known influenza virus have similar names, they are actually completely different types of viruses," said Li Dong, chief physician of the Department of Infectious Diseases at You'an Hospital in Beijing, on the 18th. "Parainfluenza virus has four subtypes, and the 'preference' of different subtypes is not quite the same."