1
|
Bajanca-Lavado MP, Pinto M, Carvalho MD, Jantarada Domingos G, Melo-Cristino J. Rare serotype c Haemophilus influenzae invasive isolate: characterization of the first case in Portugal. Eur J Clin Microbiol Infect Dis 2024; 43:791-795. [PMID: 38332396 DOI: 10.1007/s10096-024-04774-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 02/02/2024] [Indexed: 02/10/2024]
Abstract
We report for the first time in Portugal a serotype c Haemophilus influenzae isolated from an adult, with HIV-1 infection. Whole-genome sequencing characterized the isolate as clonal complex ST-7, albeit with a novel MLST (ST2754) due to a unique atpG profile. Integration of this genome with other available H. influenzae serotype c genomes from PubMLST revealed its overall genetic distinctiveness, with the closest related isolate being identified in France in 2020. This surveillance study, involving collaboration among hospitals and reference laboratory, successfully contributed to the identification and characterization of this rare serotype.
Collapse
Affiliation(s)
- Maria Paula Bajanca-Lavado
- Haemophilus Influenzae Reference Laboratory, Department of Infectious Diseases, National Institute of Health, Lisbon, Portugal.
| | - Miguel Pinto
- Genomics and Bioinformatics Unit, Department of Infectious Diseases, National Institute of Health, Lisbon, Portugal
| | - Maria Dinah Carvalho
- Laboratório de Microbiologia, Serviço de Patologia Clínica, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - Gonçalo Jantarada Domingos
- Infectious Diseases Department, Santa Maria Hospital-Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
| | - José Melo-Cristino
- Laboratório de Microbiologia, Serviço de Patologia Clínica, Centro Hospitalar Universitário Lisboa Norte, Lisbon, Portugal
- Instituto de Microbiologia, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| |
Collapse
|
2
|
Harris TM, Price EP, Sarovich DS, Nørskov-Lauritsen N, Beissbarth J, Chang AB, Smith-Vaughan HC. Comparative genomic analysis identifies X-factor (haemin)-independent Haemophilus haemolyticus: a formal re-classification of ' Haemophilus intermedius'. Microb Genom 2020; 6. [PMID: 31860436 PMCID: PMC7067038 DOI: 10.1099/mgen.0.000303] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The heterogeneous and highly recombinogenic genus Haemophilus comprises several species, some of which are pathogenic to humans. All share an absolute requirement for blood-derived factors during growth. Certain species, such as the pathogen Haemophilus influenzae and the commensal Haemophilus haemolyticus, are thought to require both haemin (X-factor) and nicotinamide adenine dinucleotide (NAD, V-factor), whereas others, such as the informally classified 'Haemophilus intermedius subsp. intermedius', and Haemophilus parainfluenzae, only require V-factor. These differing growth requirements are commonly used for species differentiation, although a number of studies are now revealing issues with this approach. Here, we perform large-scale phylogenomics of 240 Haemophilus spp. genomes, including five 'H. intermedius' genomes generated in the current study, to reveal that strains of the 'H. intermedius' group are in fact haemin-independent H. haemolyticus (hiHh). Closer examination of these hiHh strains revealed that they encode an intact haemin biosynthesis pathway, unlike haemin-dependent H. haemolyticus and H. influenzae, which lack most haemin biosynthesis genes. Our results suggest that the common ancestor of modern-day H. haemolyticus and H. influenzae lost key haemin biosynthesis loci, likely as a consequence of specialized adaptation to otorhinolaryngeal and respiratory niches during their divergence from H. parainfluenzae. Genetic similarity analysis demonstrated that the haemin biosynthesis loci acquired in the hiHh lineage were likely laterally transferred from a H. parainfluenzae ancestor, and that this event probably occurred only once in hiHh. This study further challenges the validity of phenotypic methods for differentiating among Haemophilus species, and highlights the need for whole-genome sequencing for accurate characterization of species within this taxonomically challenging genus.
Collapse
Affiliation(s)
- Tegan M Harris
- Child Health Division, Menzies School of Health Research, Darwin, NT, Australia
| | - Erin P Price
- GeneCology Research Centre, University of the Sunshine Coast, Sippy Downs, QLD, Australia.,Child Health Division, Menzies School of Health Research, Darwin, NT, Australia
| | - Derek S Sarovich
- GeneCology Research Centre, University of the Sunshine Coast, Sippy Downs, QLD, Australia.,Child Health Division, Menzies School of Health Research, Darwin, NT, Australia
| | | | - Jemima Beissbarth
- Child Health Division, Menzies School of Health Research, Darwin, NT, Australia
| | - Anne B Chang
- Department of Respiratory and Sleep Medicine, Queensland Children's Hospital, Brisbane, QLD, Australia.,Child Health Division, Menzies School of Health Research, Darwin, NT, Australia
| | - Heidi C Smith-Vaughan
- School of Medicine, Griffith University, Gold Coast, QLD, Australia.,Child Health Division, Menzies School of Health Research, Darwin, NT, Australia
| |
Collapse
|
3
|
Price EP, Harris TM, Spargo J, Nosworthy E, Beissbarth J, Chang AB, Smith-Vaughan HC, Sarovich DS. Simultaneous identification of Haemophilus influenzae and Haemophilus haemolyticus using real-time PCR. Future Microbiol 2017; 12:585-593. [PMID: 28604066 DOI: 10.2217/fmb-2016-0215] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
AIM To design a highly specific and sensitive multiplex real-time PCR assay for the differentiation of the pathogen Haemophilus influenzae from its nonpathogenic near-neighbor Haemophilus haemolyticus. MATERIALS & METHODS A comparison of 380 Haemophilus spp. genomes was used to identify loci specific for each species. Novel PCR assays targeting H. haemolyticus (hypD) and H. influenzae (siaT) were designed. RESULTS & DISCUSSION PCR screening across 143 isolates demonstrated 100% specificity for hypD and siaT. These two assays were multiplexed with the recently described fucP assay for further differentiation among H. influenzae. CONCLUSION The triplex assay provides rapid, unambiguous, sensitive and highly specific genotyping results for the simultaneous detection of hypD and siaT, including fucose-positive H. influenzae (fucP), in a single PCR.
Collapse
Affiliation(s)
- Erin P Price
- Child Health Division, Menzies School of Health Research, Darwin, NT, Australia.,Centre for Animal Health Innovation, Faculty of Science, Health, Education & Engineering, University of the Sunshine Coast, Sippy Downs, QLD, Australia
| | - Tegan M Harris
- Child Health Division, Menzies School of Health Research, Darwin, NT, Australia
| | - Jessie Spargo
- Child Health Division, Menzies School of Health Research, Darwin, NT, Australia
| | - Elizabeth Nosworthy
- Child Health Division, Menzies School of Health Research, Darwin, NT, Australia
| | - Jemima Beissbarth
- Child Health Division, Menzies School of Health Research, Darwin, NT, Australia
| | - Anne B Chang
- Child Health Division, Menzies School of Health Research, Darwin, NT, Australia
| | | | - Derek S Sarovich
- Child Health Division, Menzies School of Health Research, Darwin, NT, Australia.,Centre for Animal Health Innovation, Faculty of Science, Health, Education & Engineering, University of the Sunshine Coast, Sippy Downs, QLD, Australia
| |
Collapse
|