# Gut microbiome composition: back to baseline?

## TL;DR

This study re-analyzes data on gut microbiome recovery after antibiotics, revealing persistent changes and suggesting microbiomes converge to a new stable state rather than fully recovering to baseline.

## Contribution

It provides new insights into microbiome dynamics post-antibiotics, challenging previous claims of full recovery within 1.5 months.

## Key findings

- Significant loss of microbial taxa persists after 180 days.
- Microbiome composition after 180 days only moderately correlates with baseline.
- Microbiomes tend to stabilize at a new state different from the original baseline.

## Abstract

In Nature Microbiology, Palleja and colleagues studied the changes in gut microbiome composition in twelve healthy men over a period of six months following an antibiotic intervention. The authors argued that the 'gut microbiota of the subjects recovered to near-baseline composition within 1.5 months' and only exhibited a 'mild yet long-lasting imprint following antibiotics exposure.' We here present a series of re-analyses of their original data which demonstrate a significant loss of microbial taxa even after the complete study period of 180 days. Additionally we show that the composition of the microbiomes after the complete study period only moderately correlates with the initial baseline states. Taken together with the lack of significant compositional differences between day 42 and day 180, we think that these findings suggest the convergence of the microbiomes to another stable composition, which is different from the pre-treatment states, instead of a recovery of the baseline state. Given the accumulating evidence of the role of microbiome perturbations in a variety of infectious and non-infectious diseases, as well as the crucial role antibiotics play in modern medicine, we consider these differences in compositional states worthy of further investigation.