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The development of a hard chancre (an ulcerated sore with hard edges) is indication of what type of STD?
Live-virus Vaccines
Vaccines that contain a version of the living virus that has been weakened so that it does not cause the disease in people with normal immune systems.
Weakened Viruses
Viruses that have been attenuated (reduced in virulence) for use in vaccines, allowing the immune system to develop immunity without causing the disease.
Immune Response
The body's defensive reaction to foreign substances or organisms, involving recognition and destruction.
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