Microbiology,
PCR and food safety.

No. Food safety focuses on the food not causing harm (biological, chemical, physical risks); quality also includes sensory, nutritional and product-consistency attributes.

Microbiological analysis looks for and identifies living microorganisms or their genetic material; physicochemical analysis measures parameters such as pH, moisture, fat or nutritional composition. The two are complementary within a quality control plan.

Not necessarily. It means no colonies were detected above the detection limit of the method and the volume plated; microorganisms present at very low concentrations might not appear.

Because the method analyzes only a portion of the sample and has a limit of detection. If the microorganism is at low concentration or unevenly distributed, it may not be in the portion analyzed or may not reach detectable levels.

Not necessarily. It indicates an elevated general microbial load, but it does not identify specific microorganisms or confirm the presence of pathogens.

No; Enterobacteriaceae is a broad family that includes many genera, of which E. coli is only one, and not all its members are of fecal origin.

In general they do not pose the same risk as a pathogen, although some mycotoxin-producing molds can carry a real health risk if consumed over a prolonged period.

Yes, this is one of its distinctive characteristics.

No. Most E. coli strains are harmless and are part of the normal intestinal flora; only a small group, such as STEC, produces toxins that cause illness.

Not always. Many companies use it as rapid screening and reserve culture for regulatory confirmation.

GMP covers general hygiene and operating conditions; HACCP is a system that identifies and controls specific hazards at concrete critical points in the process, built on the assumption that GMP is already working correctly.

It is a community of microorganisms attached to a plant surface, such as stainless steel, rubber or plastic, and wrapped in a matrix of polysaccharides, proteins, nucleic acids and lipids that the cells themselves produce.