Contrôles microbiologiques de l’environnement (air et surfaces)

P. Simmons Calderdale & Huddersfield NHS Foundation Trust, UK

In principal British NHS manufacturing and aseptic units follow the guidance given in the EU Guidance on Good Manufacturing Practice1 (“The Orange Guide”). A further reference is the Quality Assurance of Aseptic Preparation Services2 which is widely used within the NHS. However the interpretation of this guidance as it applies to a very diverse range of facilities from large scale manufacturing units to small aseptic preparation laboratories does present challenges.

The range of microbiological monitoring includes the following ;

  1. Settle plates left open for a session up to 4 hours or the results normalised for a four hour exposure period.
  2. Contact plates.
  3. Surface swabs.
  4. Finger dabs.
  5. Airborne monitoring using commercially available sampling pumps and the results normalised to cfu/m3.
  6. Validation of materials transfer, particularly in aseptic units.
  7. Speciation of microorganisms recovered from plates etc.

Monitoring frequencies can vary, but a rough guide is given below ;

1. Each working session for critical work zones (EU Class A)

  • Settle plates
  • Finger dabs

2. Weekly ;

  • Clean room settle plates
  • Clean room contact plates
  • Clean room swabs

3. Monthly/3 monthly more intensive monitoring with ;

  • Settle plates, contact plates and swabs.

4. Active air sampling

  • Practice varies widely from weekly use in critical work-zones and clean rooms to 3 monthly monitoring of these areas.
  • Monitoring of particular validation exercises e.g. broth fills.

Interpretation of results

In general the limits given in the Annex 1 to the Orange Guide are followed. In addition MHRA inspection guidance has indicated that an overall microbial contamination level in aseptic units should be less than 5% of all samples from critical work-zones (good units should certainly be achieving 1-2% or less). Trending of low levels of microbial contamination presents particular challenges and there is currently no specific guidance on how this is to be managed.

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