What fundamental biological characteristic did Louis Pasteur discover about his early vaccines?
Answer
They were inherently unstable and lost efficacy when warmed.
Louis Pasteur identified that vaccines derived from living cultures or sensitive tissues were biological materials that required strictly controlled environments to maintain their immunogenic potential. The inherent instability of these early vaccines meant that without immediate and constant cooling, the active components would degrade, rendering the substance ineffective for provoking an immune response. This finding established that biological tools are distinct from inert pharmaceutical drugs, necessitating a logistical system to preserve them from creation to the moment of delivery.
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