Michelle Roberts “Emerging sex disease MG 'could become next superbug'” https://www.bbc.com/news/health-44777938
Mycoplasma genitalium is a bacterium that can cause inflammation of the urethra in men, causing discharge from the penis and making it painful to urinate.
In women, it can cause inflammation of the reproductive organs (womb and fallopian tubes) too, causing pain and possibly a fever and some bleeding.
You can get it by having unprotected sex with someone who has it. Condoms can prevent this spread.
It was first identified in the UK in the 1980s and is thought to affect 1-2% of the general population.
MG does not always cause symptoms and will not always need treatment, but it can be missed or mistaken for a different sexually transmitted infection, such as Chlamydia.
Eradication rates of MG following treatment with one family of antibiotics, called macrolides, are decreasing globally. Macrolide resistance in UK is estimated at about 40%, say the guidelines.
Another antibiotic, azithromycin, still works in most cases.
*1:See eg. “Mycoplasma genitalium” https://microbewiki.kenyon.edu/index.php/Mycoplasma_genitalium J D C Ross and J S Jensen “Mycoplasma genitalium as a sexually transmitted infection: implications for screening, testing, and treatment” https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2564705/ “What Is Mycoplasma Genitalium?” https://www.webmd.com/sexual-conditions/mycoplasma-genitalium https://en.wikipedia.org/wiki/Mycoplasma_genitalium https://ja.wikipedia.org/wiki/%E3%83%9E%E3%82%A4%E3%82%B3%E3%83%97%E3%83%A9%E3%82%BA%E3%83%9E%E3%83%BB%E3%82%B8%E3%82%A7%E3%83%8B%E3%82%BF%E3%83%AA%E3%82%A6%E3%83%A0