Incidence and severity of pertussis hospitalisations in infants aged less than 1 year in 37 hospitals of six EU/EEA countries, results of PERTINENT sentinel pilot surveillance system, December 2015 to December 2018 Merdrignac, Lore and Aït El Belghiti, Fatima and Pandolfi, Elisabetta and Jané, Mireia and Murphy, Jane and Fabiánová, Kateřina and García Cenoz, Manuel and Flem, Elmira and Guillot, Sophie and Tozzi, Alberto E and Carmona, Gloria and Habington, Adele and Zavadilová, Jana and Navasués, Ana and Bøås, Håkon and Lévy-Brühl, Daniel and Ferretti, Beatrice and Lanaspa, Miguel and O’Sullivan, Niam and Křížová, Pavla and Fernandino, Leticia and Bekkevold, Terese and Hanslik, Thomas and Muñoz-Almagro, Carmen and Bacci, Sabrina and Spiteri, Gianfranco and Valenciano, Marta and Moren, Alain and PERTINENT Group, Eurosurveillance, 26, 1900762 (2021), https://doi.org/10.2807/1560-7917.ES.2021.26.4.1900762