Comparative study of OMNIgene®•SPUTUM reagent versus cold-chain for the transportation of sputum samples to GeneXpert®MTB/RIF testing sites in Malawi
Alemayehu et al.
The finding, in our words
OMNIgene SPUTUM treated sputum specimens stored and transported at ambient temperature for up to 29 days yielded GeneXpert MTB/RIF results comparable to cold chain samples, with very good inter test agreement (kappa 0.97) and 99% overall agreement, supporting decentralised testing without cold chain.
A paraphrase to the Library’s standard, never the abstract. The source is one link away and is always the authority.
In children, stool preserved in OMNIgene-GUT kept its microbial community structure better than unpreserved stool, with alpha and beta diversity similar to direct freezing, which supports the kit for decentralised stool collection from children.
Processing stool samples with OMNIgene SPUTUM significantly improved the diagnostic yield of Mycobacterium tuberculosis using the Xpert MTB/RIF Ultra assay compared to standard methods, offering a viable alternative for patients who cannot produce sputum.
TB-MBLA testing of OMNIgene-stabilised stool detected Mycobacterium tuberculosis with 80% sensitivity and 79% specificity against sputum culture in 100 adults, offering a viable alternative for patients unable to produce sputum. The RNA-based assay quantified bacterial load, showing higher burdens in HIV-co-infected individuals, while stool cultures suffered 21-26% contamination rates.
The paper identified that the Zymo DNA/RNA shield preservative paired with the QIAamp Viral RNA Mini Kit extraction yielded more detectable SARS-CoV-2 RNA from stool than the OMNIgene-GUT kit or storage without preservative. This supports decentralised diagnostics by establishing a validated method for preserving and analysing self-collected stool samples, enabling reliable detection of viral shedding for epidemiology and patient management.
Natarajan et al., Nature communications · source ↗
This study found that saliva collected with the OMNIgene ORAL kit and stored at room temperature for up to 13 months allowed for the detection of Plasmodium falciparum DNA with high sensitivity and specificity compared to blood tests, suggesting it is a viable non-invasive alternative for malaria diagnosis.