Influenza vaccine effectiveness against hospitalizations in children and older adults—Data from South America, 2013–2017. A test negative design by Carmen Sofia Arriola, Nathalie El Omeiri, Eduardo Azziz-Baumgartner, Mark G. Thompson, Viviana Sotomayor-Proschle, Rodrigo A. Fasce, Martha Von Horoch, José Enrique Carrizo Olalla, Walquíria Aparecida Ferreira de Almeida, Jacqueline Palacios, Rakhee Palekar, Paula Couto, Miguel Descalzo, Alba María Ropero-Álvarez, Cecilia Gonzalez, Sergio Loayza, Natalia Vergara, Patricia Bustos, Winston Andrade, Carla Magda S. Domingues, Ernesto Issac Montenegro Renoiner, Érica Tatiane da Silva, Swamy Lima Palmeira, Daiana Araujo da Silva, Ana Carolina de Lacerda Sousa, Marilda Mendonça Siqueira, Cynthia Vazquez, Silvia Battaglia, Carla Vizzotti, Elsa Baumeister, Carlos Giovacchini, Nathalia Katz, Oscar Pacheco, Juliana Barbosa, Diana Malo, Paola Pulido, Diego Garcia, Consuelo Pinzón

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