You don't know much about how a disease spreads do you.
For a disease to spread, if needs to move from host to host. If a polygamous marriage has no extra marital shenanegans going on, there is no way for the disease to enter the marriage, and even if it does, it stays confined to the marriage group.
Sexual contact needs multiple partners to spread the disease, which is why much of the third world has run rife with AIDS, because prostitutes are more likely to be having unprotected sex (due to lack of education, cost of contraception, etc).
When it comes to stopping AIDS, you need to stop people using second hand needles, and if they cannot keep their pecker in their pants, wear a condom.
For a disease to spread, if needs to move from host to host. If a polygamous marriage has no extra marital shenanegans going on, there is no way for the disease to enter the marriage, and even if it does, it stays confined to the marriage group.
Sexual contact needs multiple partners to spread the disease, which is why much of the third world has run rife with AIDS, because prostitutes are more likely to be having unprotected sex (due to lack of education, cost of contraception, etc).
When it comes to stopping AIDS, you need to stop people using second hand needles, and if they cannot keep their pecker in their pants, wear a condom.