Microbiological sampling is the process of collecting, preserving and analyzing samples in order to detect, identify and quantify microorganisms (bacteria, fungi, viruses, yeasts...) present in a given environment, product or surface.
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Microbiological sampling

 

The microbiological sampling is the process of collection, preservation and analysis of samples with the objective of detecting, identifying and quantifying microorganisms (bacteria, fungi, viruses, yeasts…) present in a given environment, product or surface.

Description

It is widely used in the food industry, pharmaceutical sector, drinking water, hospitals, environment, and any field where the presence of microbes impacts safety or quality.

The main objectives are to evaluate the microbiological quality of a product or environment.

  • Verify regulatory compliance (ISO, GMP, WHO, health regulations…).
  • Detect contamination in production stages.
  • Monitor the effectiveness of cleaning and disinfection processes.
  • Investigate incidents (outbreaks, deviations, hygiene failures).

In pharma, microbiological sampling is a critical activity to ensure that drugs – especially sterile drugs – are manufactured under controlled conditions, free of microorganisms that could compromise patient safety.

Main objectives in pharma

To ensure the microbiological quality of the product during all phases of the process.

2. Confirm compliance with GMP, Annex 1 (EudraLex) and FDA aseptic processing guidance.

3. Monitor the environmental condition of clean rooms, booths, laminar flows and sterile areas.

4. Monitor personnel hygiene, the major source of contamination.

5. Prevent deviations, recalls and risks to the patient.

Type of microbiological sampling

1. Environments

In classified clean rooms (ISO 5 to ISO 8 / Grades A-D):

– Active impaction air (SAS, MAS, PAB).

– Air by passive sedimentation (settle plates).

– Viable and in some cases non-viable particles.

2. Surfaces

– Swabs

– Contact plates (RODAC)

– Sampling after cleaning/disinfection

3. Staff

Before, during or after critical operations:

– Fingerprints (finger plates)

– Sterile clothing: gloves, sleeves, apron

4. Pharmaceutical water

According to type:

– PW (Purified Water)

– WFI (Water for Injection)

– Condensates, process water

Mesophiles, endotoxins and sometimes specific pathogens are evaluated.

5. Intermediate or final products

– Bioburden count

– Sterility tests (for sterile products)

– Endotoxin assays (LAL)

Key regulations for microbiological sampling

The requirements are very specific:

EudraLex Volume 4 – Annex 1 (EMA)

Guidelines for sterile manufacturing, revised 2022-2023.

Defines:

  • Microbiological limits by grade
  • Monitoring frequencies
  • Contamination Control Strategy (CCS)

FDA – Guidance for Industry: Sterile Drug Products Produced by Aseptic Processing

Fundamental in the United States.

Sets expectations for environmental sampling, surfaces and operators.

ISO 14644 / ISO 14698

Contamination control in clean rooms.

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