Rapid increase in pertactin-deficient Bordetella pertussis isolates, Australia.
Emerg Infect Dis
; 20(4): 626-33, 2014 Apr.
Article
em En
| MEDLINE
| ID: mdl-24655754
ABSTRACT
Acellular vaccines against Bordetella pertussis were introduced in Australia in 1997. By 2000, these vaccines had replaced whole-cell vaccines. During 2008-2012, a large outbreak of pertussis occurred. During this period, 30% (96/320) of B. pertussis isolates did not express the vaccine antigen pertactin (Prn). Multiple mechanisms of Prn inactivation were documented, including IS481 and IS1002 disruptions, a variation within a homopolymeric tract, and deletion of the prn gene. The mechanism of lack of expression of Prn in 16 (17%) isolates could not be determined at the sequence level. These findings suggest that B. pertussis not expressing Prn arose independently multiple times since 2008, rather than by expansion of a single Prn-negative clone. All but 1 isolate had ptxA1, prn2, and ptxP3, the alleles representative of currently circulating strains in Australia. This pattern is consistent with continuing evolution of B. pertussis in response to vaccine selection pressure.
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Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Proteínas da Membrana Bacteriana Externa
/
Bordetella pertussis
/
Fatores de Virulência de Bordetella
País como assunto:
Oceania
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article