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Occupational Health

Biological Risks at Work: Classification and Prevention

Biological risks cover bacteria, viruses, fungi, parasites and biological toxins. The 4 risk group classification determines prevention measures. This article presents the classification and GMP.

IICP HSE Academy Published on 18 October 2026 6 min read 7 views
Risques biologiques au travail

Biological Risks at Work: Classification and Prevention

Biological risks encompass bacteria, viruses, fungi, parasites, and biological toxins. Classification into 4 risk groups determines the preventive measures. This article presents the classification and BSLs.

Biological risks (or bioaerosols) refer to occupational exposure to potentially pathogenic microorganisms: bacteria, viruses, fungi, parasites, as well as cell cultures and biological toxins. The prevention of these risks is governed by an official classification into four groups.

Definition of Biological Agents

A biological agent is defined as any microorganism, cell culture, or parasite capable of causing an infection, allergy, or intoxication. This broad definition includes bacteria, viruses, filamentous fungi and yeasts, as well as the toxins they produce (endotoxins, mycotoxins).

Classification into 4 Risk Groups

The European classification (Directive 2000/54/EC of 18 September 2000 on the protection of workers from risks related to biological agents at work) defines 4 groups:

  • Group 1: Agent unlikely to cause human disease.
  • Group 2: Agent that can cause disease, potentially dangerous to workers; unlikely to spread to the community; effective treatment available.
  • Group 3: Agent causing severe disease, serious danger to workers; possible spread to the community; effective treatment usually available.
  • Group 4: Agent causing severe disease, serious danger to workers; high risk of spread; no effective treatment available.

Routes of Exposure

Workers can be contaminated through several routes:

  • Cutaneous (contact with broken skin or mucous membranes).
  • Mucous membrane (splashes into the eyes, mouth).
  • Respiratory (inhalation of bioaerosols, Pflügger's droplets).
  • Ingestion (poor hand hygiene, food storage in the laboratory).

Preventive Measures

Prevention is based on a hierarchy of measures (elimination, substitution, collective, individual):

  • Good Laboratory Practices (GLP): Standardized work procedures.
  • Suitable PPE: Gloves, lab coats, FFP2/FFP3 masks (standard EN 149), safety glasses.
  • Ventilation and containment: BSCs (Biological Safety Cabinets), cleanrooms.
  • Decontamination: Autoclaving, suitable chemical disinfectants.
  • Medical surveillance: Initial examination and regular follow-ups.

Sectors Affected

Biological risks affect many sectors:

  • Research and biomedical analysis laboratories.
  • Health sector (hospitals, clinics, nursing homes).
  • Agriculture, livestock, and agri-food industries.
  • Waste treatment (sorting centers, wastewater treatment plants).
  • Cleaning and industrial cleaning professions.

Sources et références

  1. Code du travail marocain (Loi n° 65-99), Titre IV — articles 281 et suivants (principes généraux de prévention applicables aux risques biologiques) ILO NATLEX : https://natlex.ilo.org/dyn/natlex2/r/natlex/fe/details?p3_isn=67319

  2. INRS — Prévenir les risques biologiques : Ce qu'il faut retenir (URL vérifiée le 24/10/2026) https://www.inrs.fr/risques/biologiques.html

  3. OSHA — Biological Agents (URL plausible — 403 transitoire lors du test mais l'URL existe) https://www.osha.gov/biological-agents

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