Examlex
In higher-order conditioning, the unconditioned stimulus and response are actually previously conditioned stimuli and responses.
Virus Mutates
The process through which a virus alters its genetic material, potentially leading to changes in its behavior and impact on health.
Different Viruses
Various types of viruses that can cause a range of illnesses, from the common cold to more severe diseases like HIV/AIDS.
Immunity
The body's ability to resist or protect against infectious diseases, typically achieved through the presence of antibodies.
Leukocytes
White blood cells that are part of the immune system, responsible for protecting the body against both infectious disease and foreign invaders.
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