San Francisco public health officials issued a warning Monday that a rare and potentially debilitating sexually transmitted disease reported recently in the Netherlands has turned up among a small number of patients in the city. Known as lymphogranuloma venereum, or LGV, the disease is a form of the common sexually transmitted infection chlamydia -- but this particular strain can cause scarring of the genitals and colon, and can produce a swelling and bursting of lymph glands near the groin. Although the disease is seldom seen outside of poor, tropical nations, doctors in Rotterdam reported 92 cases among gay men during...