Cyanobacteria, what to do?

If you develop symptoms following contact with water containing cyanobacteria, immediately cease any contact with the water.

Rinse your skin with proper water. If this takes place at a public beach, immediately inform the person in charge.

If the symptoms persist or if your state of health worries you, immediately dial the Info-Santè number (811) or contact your family doctor. 

Note that the symptoms found below can be brought on by other than cyanobacteria  (for example: fecal materials in the water or bather dermatitis).

Through direct contact

  • Irritation of the skin
  • Irritation of the nose
  • Irritation of the throat
  • Irritation of the eyes.


Through ingestion

  • Stomach ache
  • Diarrhea
  • Vomiting
  • Nausea


More rarely:

  • Vertigo
  • Headache
  • Fever
  • Liver damage
  • Damage to the nervous system