Chlamydia remained the most common STD with more than 1.7 million cases diagnosed, up from around 1.6 million the year before.
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"We are sliding backward", Jonathan Mermin, the CDC's director for HIV/AIDS, Viral, STD and TB Prevention, said.
The federal health agency said in a report released Tuesday that the numbers reflect a "steep, sustained increase" in STDs since 2013.
Nearly half - 45 percent - of chlamydia diagnoses were among 15- to 24-year-old females. This featured a doubling of cases among men, but the CDC explains that "increases in diagnoses among women - and the speed with which they are increasing - are also concerning", adding that this is the third consecutive year that cases have risen.
The CDC is urging doctors to stem the spread of STDs by promoting frank discussion of the infections, testing patients for STDs and promptly treating any cases they find.
Primary and secondary syphilis diagnoses increased 76 percent.
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Gonorrhea diagnoses almost doubled among gay men - going from 169,130 cases in 2013 to 322,169 a year ago.
All three of the diseases are treatable but woman could suffer from permanent damage to the reproductive system and men to the prostate if not addressed.
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But often, the infections go undiagnosed and untreated, and may lead to infertility, ectopic pregnancy, stillbirth in infants, and increased HIV risk.
The spike has also been blamed on lower condom usage and antibiotic-resistant strains of diseases.
"We expect gonorrhea will eventually wear down our last highly effective antibiotic, and additional treatment options are urgently needed", Bolan said.
Over the years, gonorrhea has become resistant to almost every class of antibiotics used against it. Ceftriaxone (Rocephin) now stands as the only antibiotic to retain high effectiveness against gonorrhea in the United States, the CDC says. "We can't let our defenses down - we must continue reinforcing efforts to rapidly detect and prevent resistance as long as possible".