The saliva microbiome profiles are minimally affected by collection method or DNA extraction protocols
Lim et al.
The finding, in our words
The bacterial profiles of saliva were statistically similar across three collection fractions and three DNA extraction methods, and the presence of a stabilising buffer did not alter the microbiome composition. This suggests that saliva sampling for microbiome analysis is robust to variations in collection and processing, which supports the feasibility of standardising self-collection protocols for decentralised diagnostics.
A paraphrase to the Library’s standard, never the abstract. The source is one link away and is always the authority.
Saliva samples collected using the OMNIgene ORAL device and oral wash samples remain stable for microbiome diversity and relative abundance analyses for up to five years when stored at -80°C. This supports the use of these self-collection methods for long-term prospective biobanking and decentralised clinical studies.
Slack et al., Microbiology spectrum (paywalled) · source ↗
Across 18 saliva samples, mouthwash collection gave higher alpha diversity than passive drooling on both Illumina and Nanopore platforms, and three preservation methods performed alike; mouthwash and simple collection are convenient decentralised options, provided a study keeps one collection method for all participants to avoid confounding.
An analysis of 88 individuals aged 7 to 18 years found that stimulated saliva collection detected disease-associated microbiome taxa that unstimulated sampling missed. The authors note that sampling protocols must be standardised before results can be compared across decentralised studies.
Self-collected oral rinses showed higher sensitivity than clinician-collected swabs for detecting oropharyngeal gonorrhoea by NAAT while maintaining specificity, with good agreement between methods. Samples remained detectable after five days at room temperature, supporting feasibility of home-based STI screening.
Vanbaelen et al., Sexually transmitted infections (paywalled) · source ↗
Fecal and oral microbiome samples showed high stability over two years at -80°C, with intraclass correlation coefficients of 0.70–0.99 for stool and above 0.74 for saliva across most collection methods. Stool collected without additive and saliva collected with Scope mouthwash showed lower stability for some measures, demonstrating that collection method choice affects reliability of stored samples for microbiome analysis in decentralised diagnostics.
Zouiouich et al., Cancer epidemiology, biomarkers & prevention : a publication of the American Association for Cancer Research, cosponsored by the American Society of Preventive Oncology (paywalled) · source ↗