Reversion of Gut Microbiota during the Recovery Phase in Patients with Asymptomatic or Mild COVID-19: Longitudinal StudyOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
Researchers examined whether gut microbiota composition changes as patients recover from asymptomatic or mild COVID-19. They followed 12 quarantined patients in Korea longitudinally and compared them with 36 pre-pandemic healthy controls.
How was it studied?
Paired fecal samples were collected from each patient at two time points: while SARS-CoV-2 RNA was still detectable in the respiratory tract, and again after it converted to negative. Samples underwent 16S rRNA amplicon sequencing (V3 to V4 region) with diversity and taxonomic analysis.
What did they find?
Bacteroidetes was depleted during infection (5.8% relative abundance) and rebounded after recovery (31.8%), a 3.34 fold increase in odds (FDR 9.17×10⁻⁵). The Firmicutes/Bacteroidetes ratio dropped from a mean of 215.02 during infection to 6.01 after recovery, and microbial evenness rose significantly (p = 0.003), all within a median 10 day interval.
Why it matters
Even asymptomatic or mild COVID-19 caused measurable gut dysbiosis, but the microbiota reverted toward a healthier, control-like composition quickly after viral clearance. The authors suggest modifying gut microbes could be a therapeutic avenue during COVID-19 recovery.