Which one of the following statements best characterizes lympho-granuloma venereum (LGV)?

LGV is a sexually transmitted disease caused by C. trachomatis of immunotypes L1, L2, and L3. It is more commonly found in tropical climates. In the United States, the sex ratio is reported to be 3.4 males to 1 female. Tetracycline has been successful in treating this disease in the early stages; however, late stages usually require surgery.