The nose is the best niche for detection of experimental pneumococcal colonisation in adults of all ages, using nasal wash

Nikolaou, Elissavet, German, Esther, Blizard, Annie, Howard, Ashleigh, Hitchins, Lisa, Chen, Tao ORCID: https://orcid.org/0000-0002-5489-6450, Chadwick, Jim, Pojar, Sherin ORCID: https://orcid.org/0000-0002-7746-3279, Mitsi, Elena, SolorzanoGonzalez, Carla, Sunny, Syba, Dunne, Felicity, Gritzfeld, Jenna, Adler, Hugh ORCID: https://orcid.org/0000-0003-4437-2298, Hinds, Jason, Gould, Katherine A., Rylance, Jamie ORCID: https://orcid.org/0000-0002-2323-3611, Collins, Andrea ORCID: https://orcid.org/0000-0002-4094-1572, Gordon, Stephen ORCID: https://orcid.org/0000-0001-6576-1116 and Ferreira, Daniela ORCID: https://orcid.org/0000-0002-0594-0902 (2021) 'The nose is the best niche for detection of experimental pneumococcal colonisation in adults of all ages, using nasal wash'. Scientific Reports, Vol 11, Issue 118279.

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Abstract

Previous studies have suggested that the pneumococcal niche changes from the nasopharynx to the oral cavity with age. We use an Experimental Human Pneumococcal Challenge model to investigate pneumococcal colonisation in different anatomical niches with age. Healthy adults (n = 112) were intranasally inoculated with Streptococcus pneumoniae serotype 6B (Spn6B) and were categorised as young 18–55 years (n = 57) or older > 55 years (n = 55). Colonisation status (frequency and density) was determined by multiplex qPCR targeting the lytA and cpsA-6A/B genes in both raw and culture-enriched nasal wash and oropharyngeal swab samples collected at 2-, 7- and 14-days post-exposure. For older adults, raw and culture-enriched saliva samples were also assessed. 64% of NW samples and 54% of OPS samples were positive for Spn6B in young adults, compared to 35% of NW samples, 24% of OPS samples and 6% of saliva samples in older adults. Many colonisation events were only detected in culture-enriched samples. Experimental colonisation was detected in 72% of young adults by NW and 63% by OPS. In older adults, this was 51% by NW, 36% by OPS and 9% by saliva. The nose, as assessed by nasal wash, is the best niche for detection of experimental pneumococcal colonisation in both young and older adults.

Item Type:	Article
Subjects:	W General Medicine. Health Professions > W 20.5 Biomedical research WC Communicable Diseases > Infection. Bacterial Infections > Bacterial Infections > WC 217 Pneumococcal infections WV Otolaryngology > Nose and Paranasal Sinuses > WV 300 General works
Faculty: Department:	Clinical Sciences & International Health > Clinical Sciences Department
Digital Object Identifer (DOI):	https://doi.org/10.1038/s41598-021-97807-1
Depositing User:	Julie Franco
Date Deposited:	16 Sep 2021 09:30
Last Modified:	14 Jun 2022 09:34
URI:	https://archive.lstmed.ac.uk/id/eprint/18930

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