Looking for Microbes in a Spacecraft Assembly Clean Room

A microbiologist collects a swab sample from the floor of a spacecraft assembly clean room at NASA Jet Propulsion Laboratory where samples such as this are taken frequently during the assembly of a spacecraft and analyzed.

A microbiologist collects a swab sample from the floor of a spacecraft assembly clean room at NASA Jet Propulsion Laboratory where samples such as this are taken frequently during the assembly of a spacecraft and analyzed.