China has seen a dramatic rise in cases of syphilis, as a result of rapid social change, US researchers say.
A report in the New England Journal of Medicine says syphilis is now the most commonly reported communicable disease in Shanghai, the second-largest city.
Pregnant women are also increasingly passing the disease to their children, with more than one baby with congenital syphilis born every hour in 2008.
No other country has seen such a rise since the discovery of penicillin.
http://news.bbc.co.uk/2/hi/asia-pacific/8664168.stm