With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: Six months before the 1988 Olympics, Louganis was diagnosed with HIV, and started antiretrovirals. At the time, people with HIV/AIDS faced great stigma often losing their jobs, being denied housing, and being ostracized. Years later, in 1995, Louganis came out publicly as HIV+. When he had injured his head at the 1988 Seoul Olympics and some blood got in the pool, Louganis said he was "paralyzed with fear" when he read about a mysterious case of HIV infection among a South Korean swimmer after the Olympics, with no discernible cause. The incident is believed to have posed no risk to others as any blood would quickly be fully diluted by the pool water, and according to John Ward, chief of HIV-AIDS surveillance at the U.S. Centers for Disease Control and Prevention, "chlorine kills HIV". Since skin is an effective barrier to HIV, the only way the virus could enter would be through an open wound; "If the virus just touches the skin, it is unheard of for it to cause infection: the skin has no receptors to bind HIV," explained Anthony Fauci.
text_B: Even though he was keeping his HIV-status secret at the time, would Louganis's fear of facing legal action if anyone could prove that they swam in the same water have just been paranoia on his part, as there were no potential cases?
NO.