Of the first four cases, three homosexuals (two Americans, one overseas Chinese student) could all have been infected abroad. One merely passed through the airport, and two made their contacts in a circle composed mostly of foreigners on Taiwan.
以前三年出現的四個病例來看﹘﹘三名同性戀患者（兩名美籍，一名僑生），都可能在國外就被感染；而且第一例只是過境機場；第二、三例在「玻璃圈內」交往的，則以外籍人士居多。