A single-center, two-year, retrospective study of epidemiological characteristics of respiratory tract infections in Changzhou, China

Introduction This was a single-center, retrospective study that analyzed the epidemiological characteristics of respiratory tract infections (RTIs) in the Second People’s Hospital of Changzhou from December 2023 to November 2025. Methods Briefly, pharyngeal swabs from 24,380 cases were harvested and subjected to RT-PCR to detect influenza A and B viruses (Flu A and B), adenovirus (ADV), human rhinovirus (HRV), respiratory syncytial virus (RSV), and Mycoplasma pneumoniae (MP). Results The total positive rate is 47.00% (11,459/24380). HRV (13.27%) was the predominant pathogen for RTIs, and HRV combined with ADV and other pathogens primarily accounted for co-infections. The overall detection rate of RTIs showed a significant sex-related relevance (χ 2 = 17.606, p < 0.001), and the positivity for each of the six respiratory pathogens differed across age groups ( p < 0.001). Individuals at 12-17 years (11.97%), 18-45 years (6.83%), 6-11 years (24.14%),