This article cites the abstracts of the following studies: - Bello PY, Carrillo-Santisteve P, Renard-Dubois S, Cheron G, Csaszar-Goutchkoff M, Lecuit M, Lortholary O. Clustered cases of infection with the A(H1N1)2009 virus at the Cardinal Amette school complex, Paris, June 2009. - Grandesso F, Isnard H, Ddass 94. Investigation at the Jeu de Paume Elementary School, Créteil, June 2009. - Carré N, Estaquio C, Gaillard N, Vinas JM, Mathieu A. Outbreak of A(H1N1)2009 infections among foreign students during a language study program, Hauts-de-Seine, July 2009. - Carré N, Deudon M, Lossouarn M, Mathieu A. Occurrence of influenza A(H1N1)2009 cases among hospital staff in a pulmonology department, July 2009. - Fischer A, Mathieu A, Landriu D, Carbonne A. Clusters of influenza A(H1N1)2009 cases at Margency Hospital.