title: [Is a pneumonia of unknown etiology still a pneumococcal pneumonia sometimes?].
authors: P J
authors: PJ
authors: Rietra
mesh_terms: D006801:Humans; D007841:Latex Fixation Tests; D011018:Pneumonia, Pneumococcal / Q000209:etiology / Q000382:microbiology*; D012680:Sensitivity and Specificity; D013183:Sputum / Q000382:microbiology*
vernacular_title: Is een pneumonie e causa ignota soms toch een pneumokokken-pneumonie?