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Does the introduction explain the objective of the research presented in the preprint?

Partly

Yes, but it could be clearer. The final paragraph lays out what they did in the study. They defined a unique signature for R3clone identification through targeted molecular diagnostics and used this signature to screen isolates from neighboring countries and public genomic databases to explore the geographic extent and cross-border transmission potential of the clone.

Are the methods well-suited for this research?

Somewhat appropriate

They used appropriate techniques for WGS and phylodynamic modeling (BEAST software w/Bayesian methods). They also used three complementary markers to ID the clone (drug resistance mutations, spoligotyping, clone-specific SNP). The qPCR validation also appears to be a strong validation approach. Overall, genomic methods are excellent. The study design has some flaws. The sampling in Burundi was convenience sampling. There design also excluded low-bacterial-load cases, and had unequal sampling across the countries they were investigating. In addition, Burundi's sample ends in 2013, while Rwanda's starts in 2021. This 8 year gap makes transmission inference very challenging as the methods cannot differentiate between historical and ongoing transmission. There is also not epidemiological linkage (travel data, contact info) to support "transmission" claims.

Are the conclusions supported by the data?

Somewhat supported

The R3clone dynamics in Rwanda, the qPCR specificity, the fact that the clone exits beyond Rwanda and the characteristic mutations identified consistently across samples were well-supported. The authors acknowledge the limitations of their cross-border transmission claim, but would argue that their claim that "urgent regional coordination" is needed is not supported. Their results show that this clone has spread to neighbors around a decade ago, and given the Burundi data ends in 2013, we do not know if the strain is still circulating. In addition, the "global presence" claim may be overstated because the existence of R3clone in public databases in Bangladesh, Peru and Belgium does not mean that it is truly circulating.

Are the data presentations, including visualizations, well-suited to represent the data?

Somewhat appropriate and clear

The figures are generally clear overall. The flowchart shows sample flow, the Skyride plot shows the R3clone's rise and fall over time. It could be helpful to have a geographic map showing where the clone actually circulates. A timeline when samples were collected could be helpful. In addition, a figure describing qPCR validation would make limitations more transparent, and allow readers to better interpret claims about cross-border transmission.

How clearly do the authors discuss, explain, and interpret their findings and potential next steps for the research?

Somewhat clearly

Limitations are honestly acknowledged, and it does show self-awareness about the data gaps. I would argue that they are unclear about the true significance of their findings or urgency of policy action. Why is coordinated action needed now when the neighbor data is over a decade old? They also don't provide very specific next steps other than, "apply this framework to other strains".

Is the preprint likely to advance academic knowledge?

Somewhat likely

The preprint provides a novel clone-specific molecular diagnostic that could have immediate clinical utility. They also provide a template for other low-resource countries to track other regional TB clones. The idea that MDR TB spreads across borders, however, is not new. The main finding from their research is not necessarily novel; the novelty lies primarily within the qPCR assay that was developed.

Would it benefit from language editing?

No

Writing was clear and easy to understand overall.

Would you recommend this preprint to others?

Yes, but it needs to be improved

Clarifying urgency claims, separate the proven from speculative findings and strengthen the discussion around the SRA database. Adding a geographic visualization, providing next steps and explicitly acknowledging that directionality cannot be determined would be good steps to take.

Is it ready for attention from an editor, publisher or broader audience?

Yes, after minor changes

Competing interests

The author declares that they have no competing interests.

Use of Artificial Intelligence (AI)

The author declares that they did not use generative AI to come up with new ideas for their review.