Attenuated virus
Attenuated virus: A weakened, less vigorous virus. An attenuated virus may be used to make a vaccine that is capable of stimulating an immune response and creating immunity, but not of causing illness.
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- Atypical measles syndrome (AMS)
Atypical measles syndrome (AMS): An altered expression of measles, AMS begins suddenly with high fever, headache, cough, and abdominal pain. The rash may appear 1 to 2 days later, often beginning on the limbs. Swelling (edema) of the hands and feet may occur. Pneumonia is common and may persist for 3 months or more. AMS […]
- Ataxia
Poor coordination and unsteadiness due to the brain’s failure to regulate the body’s posture and regulate the strength and direction of limb movements. Ataxia is usually due to disease in the cerebellum of the brain, which lies beneath the back part of the cerebrum.
- AT (in DNA)
AT (in DNA): AT stands for adenine and thymine, a base pair in DNA. The other base pair in DNA is GC (guanine and cytosine).
- Auditory acuity
Auditory acuity: The clarity or clearness of hearing, a measure of how well a person hears. Auditory acuity is measured in order to determine a person’s need for a hearing aid.
- Auditory aphasia
Auditory aphasia: Impairment in the understanding of auditory language and communication. Sounds are heard but they convey no meaning. The 20th century Russian composer Vissarion Shebalin had auditory aphasia after a stroke but remained an outstanding composer. The comprehension of auditory language and the musical organization of acoustic perception rely on different systems in the […]