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Nowadays, AIDS has spread from high-risk groups to the general population. What is a high-risk group? It refers to people who are prone to illness, also known as susceptible groups.

How can we estimate the transmission of AIDS from high-risk groups to the general population? It’s about looking at the ratio of men to women getting sick. At first, men were more likely to fall ill. Later, these people passed the disease on to their wives and children, so the number of female infections gradually increased, and mother-to-child transmission was also on the rise. Nowadays, in some places, the ratio of men to women has reach......