Two persons each have 3 partners, and the other six each have 2 partners.
Yet transmission will be less efficient in network A, and prevention will be more difficult in network B. HIV Incidence Among Young Men Who Have Sex With Men—-Seven U.
For example, African American gay and bisexual men may take no more risk than white men, but appear to get infected much faster.
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This network configuration may have explained the relatively low HIV transmission levels.
In contrast, HIV persons in New York City, NY occupied central positions within their needle-sharing and sexual risk networks, which helped explain the high observed levels of infection. Sexual networks and partner selection help explain racial differences in HIV/STD infection rates.
Concurrent partners can connect each of their respective clusters and networks as well. Age and race mixing patterns of sexual partnerships among Asian men who have sex with men: implications for HIV transmission and prevention.
Concurrency alone can fuel an epidemic even if the average number of partners is relatively low.
This increases the probability for transmission, because earlier partners can be infected by later partners.