Whole genome sequencing of drug-resistant Mycobacterium tuberculosis isolates in Victoria, Australia.
Int J Infect Dis
; 138: 46-53, 2024 Jan.
Article
en En
| MEDLINE
| ID: mdl-37967715
ABSTRACT
OBJECTIVES:
Whole genome sequencing (WGS) can identify clusters, transmission patterns, and drug resistance mutations. This is important in low-burden settings such as Australia, as it can assist in efficient contact tracing and surveillance.METHODS:
We conducted a retrospective cohort study using WGS from 155 genomically defined drug-resistant Mycobacterium tuberculosis (DR-TB) isolates collected between 2018-2021 in Victoria, Australia. Bioinformatic analysis was performed to identify resistance-conferring mutations, lineages, clusters and understand how local sequences compared with international context.RESULTS:
Of the 155 sequences, 42% were identified as lineage 2 and 35% as lineage 1; 65.8% (102/155) were isoniazid mono-resistant, 8.4% were multi-drug resistant TB and 5.8% were pre-extensively drug-resistant / extensively drug-resistant TB. The most common mutations were observed in katG and fabG1 genes, especially at Ser315Thr and fabG1 -15 C>T for first-line drugs. Ser450Leu was the most frequent mutation in rpoB gene. Phylogenetic analysis confirmed that Victorian DR-TB were associated with importation events. There was little evidence of local transmission with only five isolate pairs.CONCLUSION:
Isoniazid-resistant TB is the commonest DR-TB in Victoria, and the mutation profile is similar to global circulating DR-TB. Most cases are diagnosed among migrants with limited transmission. This study highlights the value of WGS in identification of clusters and resistance-conferring mutations. This information is crucial in supporting disease mitigation and treatment strategies.Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Tuberculosis Resistente a Múltiples Medicamentos
/
Mycobacterium tuberculosis
Límite:
Humans
País/Región como asunto:
Oceania
Idioma:
En
Revista:
Int J Infect Dis
Asunto de la revista:
DOENCAS TRANSMISSIVEIS
Año:
2024
Tipo del documento:
Article
País de afiliación:
Australia