"In cases like the Su couple, where both man and woman are intravenous drug users, the chance of infection is even higher because it can occur through both sexual behavior and sharing of needles, and often both people end up drawing the short straw," says Yang.
「如同蘇氏夫婦的案例，男女雙方若都吸毒，無論是因為性行為或是共用針頭，發生交叉感染的比率更高，往往最後都雙雙中獎，」楊世仰指出。