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Epidemiology of Haemophilus influenzae in the Republic of Ireland, 2010–2018
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Epidemiology of Haemophilus influenzae in the Republic of Ireland, 2010–2018
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Epidemiology of Haemophilus influenzae in the Republic of Ireland, 2010–2018
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Journal Article
Epidemiology of Haemophilus influenzae in the Republic of Ireland, 2010–2018
2020
Overview
The purpose of this study was to investigate H. influenzae epidemiology in the Republic of Ireland. We performed serotyping, multi-locus sequence typing (MLST) and susceptibility testing on H. influenzae isolates received by the Irish Meningitis and Sepsis Reference Laboratory from 2010 to 2018. Three hundred sixty-seven invasive and 41 non-invasive infection (NII) isolates were received. Invasive isolates were mostly recovered from paediatric (21%) and elderly (42%) populations. Invasive disease was more prevalent in females of childbearing age (72%) compared with males the same age (28%). Non-typeable H. influenzae (NTHi) predominated among invasive (83%) and NII (95%). Invasive Hib disease isolates were infrequent (4%, n = 15). Among invasive disease, Hif was the commonest encapsulated serotype (10%, n = 37), and the only encapsulated serotype detected in NII (5%, 2/41). The first PCR-confirmed serotypes d and a in Ireland were characterised among invasive disease in 2017 and 2018, respectively. MLST revealed a diverse NTHi population, while encapsulated serotypes were clonal. Sequence type (ST) 103 (n = 14) occurred exclusively in invasive NTHi disease. Ampicillin resistance (AmpR) was 18% among invasive isolates and 22% in NII. β-Lactamase production was the main source of ampicillin resistance in invasive and NII isolates. We detected β-lactamase negative ampicillin resistance (BLNAR) among invasive isolates. We report an NTHi fluoroquinolone-resistant clone: ST1524 among invasive (n = 2) and NII isolates (n = 2). The Hib vaccine has positively impacted on Hib disease in Ireland, given the low frequency of Hib. The dominance of NTHi, emergence of serotypes a and d and BLNAR suggest a changing H. influenzae epidemiology in Ireland.
Publisher
Springer Nature B.V
Subject
