"It's about time the public learned about Mycoplasma genitalium", he said.
The British Association of Sexual Health and HIV is launching new advice. It says that although awareness of MG is low, it is in fact more prevalent than gonorrhoea.
In 2015, the U.S. Centers for Disease Control and Prevention (CDC) labeled MG an "emerging issue" among STDs.
A USA study noted that 1.0 percent of sexually active adolescents may have Mycoplasma genitalium, making it the third most common STD among young people in the country behind chlamydia (4.2 percent) and trichomoniasis (2.3 percent), the website Mycoplasma Cure.com reported. For men it causes inflammation of the urethra and could lead to watery discharges from the penis. Though it may mimic some of the same symptoms, it is not caused by gonorrhea.
Scientists have found that bacteria can lead to inflammatory disease of the pelvis and, ultimately, infertility in women if left untreated.
The disease is often asymptomatic, which means that it does not show symptoms of infection. When looking at specific symptoms, women with MG were significantly more likely to report having experienced bleeding after sex'.
However, many people do not show symptoms, especially women.
Researchers are seeking more information about the disease since it's only recently been studied.
What are the symptoms and risks of MG?What are the symptoms of this STI and potential effects of untreated infection?
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The organism can take up to six months to grow for diagnosis, with commonly used tests.
MG can be diagnosed by a 'nucleic acid amplification test (NAAT)'.
Antibiotics are not as effective at treating MG as some other STDs.
BASHH recommends that MG is treated with a seven-day course of the antibiotic, doxycycline, followed by a course of azithromycin. Experts have warned that if it continues to become resistant to antibiotics, it can become a full-blown superbug causing infertility in more than 3,000 women.
How can it be prevented?
"The new guidelines will be helpful, but unless and until we get funds so we can regularly test for it, we'll be in the dark about which women with pelvic inflammatory disease have got it and about what their true risk of long term complications are", Greenhouse told CNN.
A photo of a condom is pictured in this undated stock photo.
MG bacteria can spread through unprotected sex with someone infected by it and can be prevented by using condoms.
Because antibiotic resistance is a particular concern in treating MG infections, it is also important to be careful not to overuse antibiotics, and to use them as directed when they are necessary.