title: Increased risk of primary invasive Haemophilus influenzae type B disease in twins.
authors.affiliation: National Public Health Institute, Helsinki, Finland.
authors.forename: A K
authors.initials: AK
authors.lastname: Takala
authors.forename: P R
authors.initials: PR
authors.lastname: Rönnberg
authors.forename: E
authors.initials: E
authors.lastname: Kela
authors.forename: J
authors.initials: J
authors.lastname: Eskola
authors.forename: M
authors.initials: M
authors.lastname: Mäkelä
mesh_terms: D002353:Carrier State / Q000453:epidemiology*; D002648:Child; D002675:Child, Preschool; D004200:Diseases in Twins / Q000453:epidemiology*; D005260:Female; D005387:Finland / Q000453:epidemiology; D006192:Haemophilus Infections / Q000453:epidemiology*; D006193:Haemophilus influenzae / Q000302:isolation & purification; D006801:Humans; D007223:Infant; D008297:Male; D009305:Nasopharynx / Q000382:microbiology; D012307:Risk Factors