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Image caption The WHO estimates one in 25 people has at least one STI. One million new sexually transmitted infections (STIs) occur every single day, the World Health Organization has estimated. That means more than 376 million new cases annually of four infections - chlamydia, gonorrhoea, trichomoniasis, and syphilis. The WHO highlights a lack of progress in stopping the spread of STIs, and says its figures are a "wake-up call". Experts are particularly concerned about the rise in drug-resistant STIs. The WHO regularly evaluates the global impact of the four common sexually transmitted infections. It looks at published research and collects reports from its workers in countries around the world. Full story

6 June