International contact tracing in venereal disease.
D004197:Disease Reservoirs; D004641:Emigration and Immigration; D005060:Europe; D005260:Female; D006801:Humans; D007391:International Cooperation; D008297:Male; D012725:Sexual Behavior; D012749:Sexually Transmitted Diseases / Q000517:prevention & control*; D014171:Transients and Migrants; D014195:Travel; D014481:United States; D014944:World Health Organization