Condom use may be declining because people have lost their fear of getting HIV, while dating apps make sex more accessible, global health expert says

‘Hidden epidemic’ has left one in 25 people with chlamydia, gonorrhoea, syphilis or trichomoniasis, WHO says in report director says should be a ‘wake-up call’

The World Health Organisation (WHO) has expressed alarm at the lack of progress on curbing sexually transmitted diseases, while one of its experts warned of complacency as dating apps are spurring sexual activity.