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Infection and Immunity, January 1999, p. 8-15, Vol. 67, No. 1
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Nucleotide Sequences of Genes Coding for Fimbrial Proteins in a Cryptic Genospecies of Haemophilus spp. Isolated from Neonatal and Genital Tract Infections

Nathalie Gousset,1 Agnes Rosenau,1 Pierre-Yves Sizaret,2 and Roland Quentin1,*

Département de Microbiologie Médicale et Moléculaire, Unité de Bactériologie, Faculté de Médecine,1 and Unité de Microscopie Electronique,2 Université François Rabelais, Tours, France

Received 5 August 1998/Returned for modification 9 September 1998/Accepted 9 October 1998

Nineteen isolates belonging to a cryptic genospecies of Haemophilus (referred to here as genital strains) isolated from genital tract infections (6 strains) and from neonatal infections (13 strains) were studied for fimbrial genes. Sixteen strains exhibit peritrichous fimbriae observed by electron microscopy. By PCR with primers corresponding to the extreme ends of the Haemophilus influenzae type b (Hib) hifA and hifD genes and Southern blotting, a hifA-like gene (named ghfA) and a hifD-like gene (named ghfD) were identified in 6 of the 19 strains. Five of these six strains were from the genital tracts of adults, and one was from a neonate. For each gene, the nucleotide sequence was identical for the six strains. A hifE-like gene (named ghfE) was amplified from only one of the 19 genital strains of Haemophilus, but the ghfE probe gave a signal in Southern hybridization with the five other strains positive for ghfA and ghfD. Therefore, these strains may carry a ghfE-like gene. The Hib fimbrial gene cluster is located between the purE and pepN genes as previously described. For the 13 genital Haemophilus strains that lack fimbrial genes, this region corresponds to a noncoding sequence. Another major fimbrial gene designated the fimbrin gene was previously identified in a nontypeable H. influenzae strain. A fimbrin-like gene was identified for all of our 19 genital strains. This gene is similar to the ompP5 gene of many Haemophilus strains. Therefore, other, unidentified genes may explain the piliation observed in electron microscopy on genital Haemophilus strains which do not possess LKP-like fimbrial genes. Fimbrial genes were significantly associated with strains isolated from the genital tract. They may confer on the strain the ability to survive in the genital tract.

* Corresponding author. Mailing address: Département de Microbiologie Médicale et Moléculaire, CHRU Bretonneau, 2 Bd Tonnellé, 37044 Tours Cedex, France. Phone: (33) 2 47 47 80 56. Fax: (33) 2 47 47 38 12. E-mail: quentin{at}pop.med.univ-tours.fr.

Infection and Immunity, January 1999, p. 8-15, Vol. 67, No. 1
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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Copyright © 1999 by the American Society for Microbiology. All rights reserved.