A card from a test kit stained by faecal specimens which have been exposed to a guaiac impregnated surface. The card has been challenged with hydrogen peroxide in the laboratory and one sample has reacted positively (blue colour) indicating the need for further tests | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / King-Holmes, James |
Taille de l’image : | 5141 px × 3426 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |