Examlex
Why will a struck tuning fork sound louder when it is held against a table?
Virus Mutates
The process by which a virus changes its genetic material, often leading to new strains that can behave differently in terms of transmission and impact on health.
Vaccine
A biological preparation that provides active acquired immunity to a particular infectious disease.
Common Cold
A viral infection of the upper respiratory tract that is characterized by congestion, runny nose, coughing, sore throat, and sometimes mild fever.
HIV Vaccine
A vaccine that is under research and development to prevent or treat the human immunodeficiency virus (HIV).
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