OBJECTIVE: To investigate the distribution of @entity3841 serotypes and DGGE subtypes among isolates from Thai @entity7278 @entity1 . DESIGN: Forty-four adult Thai @entity2521 @entity1 were assessed by a full mouth recording for CAL, @entity4035 , and @entity19537 . Seventy-nine strains of A. actinomycetemcomitans were isolated from deep pockets on selective TSBV agar and 17 strains were isolated from shallow pockets. The strains were serotyped using PCR and subtyped using DGGE. RESULTS: The prevalence of A. actinomycetemcomitans was 84.1%. Non-serotypeable A. actinomycetemcomitans strains occurred equally frequent as serotypeable (54.5%); serotype a 18.2%, serotype c 15.9%, serotype e 9.1%, and serotype f 11.4%. Serotype b and d were not detected. A @entity39300 like strain but serotyped @entity2031 was isolated from two @entity1 , and another two strains showed an 886bp insertion on the ltx promoter of their A. actinomycetemcomitans isolates. DGGE typing disclosed 16 different subtypes among the non-serotypeable strains. Two of them ( @entity8768 and @entity3535 ) were more common (12.7 and 10.1%) among the strains than the other 14 subtypes (  5.1%). Most @entity1 showed only one subtype (32.4%) but 29.7% had 2 and 3 different subtypes while 8.1% revealed 4 subtypes in one and the same deep pocket. CONCLUSION: This study showed a greater subtype diversity of A. actinomycetemcomitans predominated by non-serotypeable strains than previously reported in an adult Thai population. It was also revealed for the first time that isolates with a 530bp deletion or 886bp insertion of the ltx promoter were serotyped as serotype c.

XXXX serotypes and DGGE subtypes in Thai adults with @entity7278 .

@entity1 :: ('9606', 'Species') :: ['patients'] @entity4035 :: ('MESH:C535387', 'Disease') :: ['PPD'] @entity19537 :: ('100294715', 'Gene') :: ['BOP'] @entity7278 :: ('MESH:D055113', 'Disease') :: ['chronic periodontitis'] @entity3535 :: ('57762', 'Gene') :: ['NS2'] @entity39300 :: ('6972', 'Gene') :: ['JP2'] @entity2521 :: ('MESH:D010518', 'Disease') :: ['periodontitis'] @entity3841 :: ('714', 'Species') :: ['Aggregatibacter actinomycetemcomitans'] @entity8768 :: ('10625', 'Gene') :: ['NS1'] @entity2031 :: ('412', 'Gene') :: ['as c']
@entity3841 :: (714,Species) :: ['Aggregatibacter actinomycetemcomitans']
