How can milk samples be contaminated by humans?

Milk samples can be contaminated by humans through improper handling and hygiene practices. For instance, if milk is collected or processed by individuals who do not wash their hands or use contaminated equipment, bacteria from skin or clothing can transfer to the milk. Additionally, airborne contaminants or contact with unclean surfaces can introduce pathogens into the milk. These factors highlight the importance of strict sanitation protocols in dairy production and sampling.