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Journal of Clinical Microbiology, February 2004, p. 807-810, Vol. 42, No. 2
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.2.807-810.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Emergence of Nonencapsulated and Encapsulated Non-b-Type Invasive Haemophilus influenzae Isolates in Portugal (1989-2001)

Paula Bajanca* Manuela Caniça, and the Multicenter Study Group{dagger},

Antibiotic Resistance Unit, National Institute of Health Dr. Ricardo Jorge, Lisbon, Portugal

Received 11 July 2003/ Returned for modification 22 August 2003/ Accepted 29 October 2003

Phenotypes and genetic relatedness of invasive Haemophilus influenzae strains were evaluated from 1989 through 2001. Among 119 isolates, multidrug resistance decreased (from 50 to 0%), the level of H. influenzae serotype b (Hib) strains declined (from 81 to 16%), the level of noncapsulated strains rose (from 19 to 80%), and the first invasive H. influenzae serotype f strain was described. This study documents changes in invasive H. influenzae infections in Portugal, i.e., the emergence of non-type-b strains that are genetically diverse and unrelated to Hib.

* Corresponding author. Mailing address: Antibiotic Resistance Unit, National Institute of Health Dr. Ricardo Jorge, Av. Padre Cruz, 1649-016 Lisbon, Portugal. Phone and fax: 351 217519246. E-mail: paula.lavado{at}insa.min-saude.pt.

{dagger} Contributing members of the Multicenter Study Group are listed in Acknowledgments.

Journal of Clinical Microbiology, February 2004, p. 807-810, Vol. 42, No. 2
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.2.807-810.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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