Lymphogranuloma venereum (LGV) is a sexually transmitted disease that is considered rare in the United States and other industrialized countries.
Lymphogranuloma Venereum (LGV): A Rare STD
According to federal health officials, Lymphogranuloma venereum (LGV), caused by specific strains of the Chlamydia trachomatis bacterium, is a systemic sexually transmitted disease that is rare in the United States and other industrialized nations.
In summary, if you're looking for a rare STD, Lymphogranuloma venereum (LGV) fits the description.