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Condoms are the best way to prevent the spread of sexually-transmitted diseases like gonorrhea.

Japanese and European researchers have identified a new strain of Neisseria gonorroeae that is exceptionally resistant to cephalosporins, the last remaining family of antibiotics available to treat the sexually transmitted disease. Although physicians have identified only a handful of infections by the new strain of gonorrhea, called H041, they fear that its ability to grow even in the presence of the cephalosporins may allow it to spread rapidly throughout the world. “This is a large public health problem and the era of untreatable gonorrhea may now have been initiated,” the team wrote in their abstract for the report presented Sunday at a Quebec City meeting of the International Society for Sexually Transmitted Disease Research. The report comes only days after the U.S. Centers for Disease Control and Prevention reported a growing incidence of gonorrhea infections that require unusually high doses of cephalosporins to cure them.

Gonorrhea, known to generations of Americans as “clap,” is one of the most common sexually transmitted diseases in the world. In the United States alone, an estimated 700,000 new cases are diagnosed each year, according to the CDC, affecting men and women. The disease exhibits no symptoms in about half of women and in about 2% to 5% of men. When symptoms appear, they typically include a burning sensation when urinating and discharge of pus from the genitals. In women, it can cause chronic pelvic pain, ectopic pregnancies and loss of fertility. In men, it can also lead to loss of fertility. In both sexes, it increases the risk of transmitting or contracting HIV. Untreated, it can prove fatal.