NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,051 terms related to cancer and medicine.
- listen (uh-TEN-yoo-way-ted)
- Weakened or thinned. Attenuated strains of disease-causing bacteria and viruses are often used as vaccines. The weakened strains are used as vaccines because they stimulate a protective immune response while causing no disease or only mild disease in the person receiving the vaccine.