Molecular Epidemiology of Haemophilus influenzae Strains with Reduced Susceptibility and Genetic Profiles of Resistance in the Postvaccination Period

被引:0
作者
Brasil, Ingrid Menezes [1 ]
de Andrade, Claudia Ferreira [1 ]
de Oliveira, Dominique Mendes [1 ]
Caldeira, Nathalia G. S. [1 ]
de Oliveira, Jaciara Rodrigues [1 ]
do Nascimento, Ana Paula A. [1 ]
de Almeida, Antonio Eugenio C. C. [1 ]
de Filippis, Ivano [1 ,2 ]
机构
[1] Fundacao Oswaldo Cruz, Inst Nacl Controle Qualidade Saude, Rio De Janeiro, Brazil
[2] Fundacao Oswaldo Cruz, Inst Nacl Controle Qualidade Saude, Av Brasil 4365, BR-21045900 Rio De Janeiro, Brazil
关键词
Haemophilus influenzae; invasive disease; conjugate vaccine; antimicrobial susceptibility; MLST; PENICILLIN-BINDING PROTEIN-3; CHANGING EPIDEMIOLOGY; DISEASE; VACCINE; MENINGITIS; AMPICILLIN;
D O I
10.1089/mdr.2022.0156
中图分类号
R51 [传染病];
学科分类号
100401 ;
摘要
Haemophilus influenzae serotype b has been the main cause of invasive infections in children, during the prevaccination period. More than 20 years after the introduction of the conjugate vaccine against Hib, HiNT has emerged as the cause of localized infections in children and adults. The main objective of this work is to evaluate the susceptibility and resistance mechanisms of H. influenzae strains from carriers and describe the molecular epidemiology and their clonal relationships by multilocus sequence typing (MLST). Sixty-nine strains from clinical cases and asymptomatic carriers from 2009 to 2019 were analyzed, confirmed as H. influenzae, and serotyped by polymerase chain reaction. The susceptibility to antibiotics was evaluated by E-test strips. Genotyping was performed by MLST. HiNT was the most frequent in all age groups. Resistance to ampicillin, sulfamethoxazole+trimethoprim, and amoxicillin+clavulanic acid was detected, with the production of beta-lactamase being the main resistance mechanism. Among 21 HiNT strains with complete allelic MLST profiles, 19 new sequence types were described, reinforcing the already reported heterogeneity of nontypeable strains, and only one clonal complex (cc-1355) was observed. Our results show a high percentage of colonization regardless of age, increased antimicrobial resistance, and high genetic diversity, along with an increased number of cases caused by HiNT strains. These findings reinforce the need for continuous surveillance for HiNT strains as it has been reported worldwide after the introduction of the Hib conjugate vaccine.
引用
收藏
页码:371 / 380
页数:10
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