Gonorrhea

It warns that if someone contracts gonorrhoea, it is now much harder to treat, and in some cases impossible.

The sexually transmitted infection is rapidly developing resistance to antibiotics.

Experts said the situation was "fairly grim" with few new drugs on the horizon.

About 78 million people pick up the STI each year and it can cause infertility.

The World Health Organization analysed data from 77 countries which showed gonorrhoea's resistance to antibiotics was widespread.

"The bacteria that cause gonorrhea are particularly smart. Every time we use a new class of antibiotics to treat the infection, the bacteria evolve to resist them," said Teodora Wi, a human reproduction specialist at the WHO, in a news release.

Three superbugs -- bacteria that cannot be killed by the best available drug -- were detected in Japan, France and Spain, according to the WHO.

"We need to be more vigilant now," Wi told reporters in a phone briefing.