That's the highest number ever reported nationwide, breaking the record set in 2016 by more than 200,000 cases, according to the CDC.
Over the years, gonorrhea has become resistant to almost every class of antibiotics used to treat it, except to ceftriaxone, the only remaining highly effective antibiotic to treat gonorrhea in the United States.
To put it bluntly, as Jonathan Mermin, director of the CDC's National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention, did in a CDC press release: "We are sliding backward".
Primary and secondary syphilis diagnoses increased 76 percent.
Nearly half - 45 percent - of chlamydia diagnoses were among 15- to 24-year-old females.
Gonorrhea cases in men almost doubled to 322,169 in 2017 compared with 2013, the CDC said.More news: Jose Mourinho provides Phil Jones update ahead of Burnley v Man United
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There's not enough screening for sexually transmitted diseases, particularly among young people who are most vulnerable, Harvey said.
PREVENTION TREATMENT. This trio of STDs can lead to infertility, stillbirths, ectopic pregnancies, and a host of other conditions if left untreated. A report has found that cases of syphilis, chlamydia, and gonorrhea have spiked for the fourth year in a row.
And yet we all but ignore these critical health components when we talk about, plan for, and pay for health. It's less clear whether dating apps, like Tinder, have contributed in some way to the spread of STDs, though some researchers think they have.
Public health experts are also concerned about antibiotic resistant gonorrhea.
"State and local STD programs are working with effectively half the budget they had in the early 2000s", Harvey said. "If our representatives are serious about protecting American lives, they will provide adequate funding to address this crisis". Doctors typically prescribe a single shot of ceftriaxone that's followed by an oral dose of a different antibiotic, azithromycin.
Chlamydia, gonorrhea, and syphilis can be cured with antibiotics. Azithromycin was added to help delay the development of resistance to ceftriaxone.