Question

prompt
describe a medical advance that has led to a decrease in the spread of communicable diseases. what is the advance? how does it prevent the spread of disease?
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Explanation:

Vaccines are a significant medical advance. They stimulate the immune system to recognize and fight specific pathogens. When a large proportion of a population is vaccinated (herd immunity), it reduces the spread of communicable diseases as there are fewer susceptible individuals for the pathogen to infect.

Answer:

Vaccines. They work by training the immune system to identify and combat specific pathogens. Through achieving herd immunity (high vaccination rates), the spread of communicable diseases is reduced as there are fewer hosts for the pathogen to infect.