title: Intrafamilial distribution of mutans streptococci in Japanese families and possibility of father-to-child transmission.
abstract: The purpose of this study was to investigate the intrafamilial distribution of mutans streptococci in Japanese families using chromosomal DNA fingerprinting with three endonucleases; EcoRI, HindIII and HaeIII. The analysis of 1,908 isolates cultured from the dental plaque of 76 subjects from 20 families (20 married couples and 36 of their children) resulted in the identification of 144 genotypes containing 114 strains of Streptococcus mutans (serotype c, 66.7%; e, 12.5%) and 30 strains of S. sobrinus (d, 13.2%; g, 7.6%). A mean of 1.89 genotypes (from one to four) was harbored in individual subjects, and a mean of 4.10 genotypes from two to seven was harbored in individual families. Among the 70 genotypes found in the children, 36 (51.4%) were in agreement with their mothers and 22 (31.4%) were in agreement with their fathers. The other genotypes (18.6%) did not correspond with the parents. Homologous strains between parents were found in only two couples. This result showed that fathers or others as well as mothers can be sources of transmission. Further, the serotype d, e and g strains showed significantly higher probabilities of transmission than serotype c.
authors.affiliation: Department of Pediatric Dentistry, Hiroshima University School of Dentistry, Hiroshima, Japan. kozai@ipc.hiroshima-u.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Kozai
authors.forename: R
authors.initials: R
authors.lastname: Nakayama
authors.forename: U
authors.initials: U
authors.lastname: Tedjosasongko
authors.forename: S
authors.initials: S
authors.lastname: Kuwahara
authors.forename: J
authors.initials: J
authors.lastname: Suzuki
authors.forename: M
authors.initials: M
authors.lastname: Okada
authors.forename: N
authors.initials: N
authors.lastname: Nagasaka
mesh_terms: D000328:Adult; D002648:Child; D002675:Child, Preschool; D003773:Dental Plaque / Q000382:microbiology*; D005192:Family Health; D005260:Female; D006801:Humans; D007223:Infant; D018445:Infectious Disease Transmission, Vertical; D007564:Japan; D008297:Male; D013290:Streptococcal Infections / Q000382:microbiology* / Q000635:transmission*; D013295:Streptococcus mutans / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification