At this point the body has lost its immune system and is subject to repeated "opportunistic infection." Symptoms may strike any part of the body. "Opportunistic infections" indicate weak viruses which may enter the body through various orifices.
進入此一階段的病人，由於喪失免疫力，會反覆遭受「伺機性感染」，全身各處都可能出現病症。