2024 Yes https://doi.org/10.2807/1560-7917.ES.2024.29.50.2400786 Takashita, Emi Asia Observational Epidemiology Study Students Elementary (K-5) Viruses Respiratory symptoms This study investigated an influenza A(H1N1)pdm09 outbreak in a Japanese elementary school using antigenic analysis and sequencing. Results showed oseltamivir and peramivir cross-resistance, highlighting the need for strong antiviral monitoring systems.