"Microbial contamination" refers to the presence of harmful microorganisms, such as bacteria, viruses, or fungi, in a particular area or substance, which can cause diseases or spoilage. Full definition
Symptoms of microbial contamination from fecal matter can cause vomiting, diarrhea, rashes, and other problems. (thinking-about-cloth-diapers.com)
Now scientists from Lawrence Berkeley National Laboratory (Berkeley Lab) have developed a highly accurate, DNA - based method to detect and distinguish sources of microbial contamination in water. (sciencedaily.com)
Here I was a microbiology technician monitoring for microbial contamination in food products or in the factory environment. (sanger.ac.uk)