Shifts in Epidemiology and Antibiotic Resistance of Haemophilus Influenzae in Children From Chongqing (2019-2024): Pre-, During, and Post-COVID-19.

Many reports indicate that the resistance rate of ampicillin and azithromycin in Haemophilus influenzae showed an increasing trend through the years, and there has been additional drug resistance to macrolides, fluoroquinolones and other beta-lactams such as carbapenems. 11–13 Chongqing, situated in southwestern China and characterized by a subtropical humid climate with distinct four seasons and a cold, dry winter, is a major city with a large population and extensive population mobility, facilitated by a well-developed transportation network.

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