Microbial Tracking 2 - Flights 4, 5

Microbial Tracking-2 is the first Space Biology human related investigation that seeks to catalog and characterize potential disease-causing microorganisms aboard the International Space Station (ISS). Crew samples from pre-flight, in-flight, and post-flight times in addition to environmental samples from ISS surface and air locations will be collected to analyze any associations between the samples, as well as potential health effects. [source: https://www.nasa.gov/ames/research/space-biosciences/microbial-tracking-2]