A woman's hand is holding a Petri dish displaying cultures; a microscope is to the right. Verso: WHO/ 14557. EURO. Cancer. France. In drug treatment, in order to achieve the correct dosage for the individual patient. checks are made by microbiological cultures of the amount of a given chemical in his blood. The size of the culture, seen here in a dish, relates to the quantity of the drug in the patient's blood.
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World Health Organization; Source: Record; Research date: 20151009