The influence of spaceflight on the astronaut salivary microbiome and the search for a microbiome biomarker for viral reactivation

This research paper presents an analysis of the microbial diversity in human saliva, comparing samples taken before and after flights. The study aimed to understand how air travel might affect our oral health by examining changes in bacteria levels using a method called ASV (Amplicon Sequence Variants). The findings showed that there are many different types of bacteria present, with some species being more common before flights and others after. Notably, the researchers observed an increase or decrease in certain beneficial bacteria like Lactobacillus (which can help maintain a healthy mouth) depending on whether it was taken pre-flight or post-flight. This study is important because changes in our microbiome could potentially impact how well we fight off diseases and overall, the state of our health. For people who fly frequently for work or pleasure, understanding these effects can help them make informed decisions about their travel habits to maintain good dental hygiene practices while on the go.

The research paper presents a comprehensive analysis of microbial diversity using high-throughput sequencing techniques, specifically focusing on the prevalence and richness of various bacteria in flight environments. The study employed shotgun metagenomic sequencing to assess airbors' bioaerosols before takeoff (preS), immediately after landing (postClo), and at multiple intervals during transit time (in-flight). Methodology: Air samples were collected from different aircraft cabins, with each sample undergoing DNA extraction followed by sequencing. The resulting sequence data was processed using bioinformatics tools to identify the microbial species present in the air based on their 16S ribosomal RNA gene sequences. A total of ten samples were analyzed for ASV (Amplicon Sequence Variant) observed richness, and Shannon's diversity index was calculated at each sampling point to quantify microbial biodiversity within the airborne environment.