Severity of influenza illness by seasonal influenza vaccination status among hospitalised patients in four South American countries, 2013–19: a surveillance-based cohort study von Regan, Annette K, Arriola, Carmen Sofia, Couto, Paula, Duca, Lindsey, Loayza, Sergio, Nogareda, Francisco, de Almeida, Walquiria Aparecida Ferreira, Antman, Julian, Araya, Soraya, Avendaño Vigueras, Marcela Alejandra, Battaglia Paredes, Silvia Carolina, Brstilo, Ivan Fedor, Bustos, Patricia, Fandiño, Maria Eugenia, Fasce, Rodrigo, Giovacchini, Carlos Maria, González Caro, Cecilia Isaura, von Horoch, Marta, del Valle Juarez, Maria, Katz, Nathalia, Olivares, Maria Fernanda, da Silva, Daiana Araújo, da Silva, Erica Tatiane, Sotomayor, Viviana, Vergara, Natalia, Azziz-Baumgartner, Eduardo, Ropero, Alba Maria

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