Bernhard Schwartlaender, the World Health Organisation's representative in China, wrote in an op-ed in the state-run China Daily newspaper that "there is much more China needs to do" to prevent infection and better help those living with HIV.
"Perhaps most importantly, we must eliminate stigma and discrimination towards people living with HIV, and at-risk populations such as men who have sex with men, sex workers, and injecting drug users," Schwartlaender wrote.
The op-ed was published on World AIDS Day, a day after the National Health and Family Planning Commission said that by the end of October, a total of 497,000 people in China had been diagnosed with HIV/AIDS since the country's first case in 1985.
The figure represents an increase from September 2013, when 434,000 people in China were known to be living with HIV/AIDS. But it was not clear whether the rise was due to an increase in infection, or more cases being diagnosed.
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China's National Center for AIDS/STD Control and Prevention last year estimated that as many as 810,000 people are living with HIV/AIDS in the country, including those who have not yet been diagnosed, out of a total population of 1.36 billion.
That is a far lower proportion than India, where UNAIDS says there are more two million people living with HIV, in a slighter smaller total population -- although UNAIDS does not give figures for China.
More than a quarter of a million HIV-positive people are currently on antiretroviral treatment in China, UNAIDS China director Catherine Sozi wrote in a China Daily op-ed on Saturday.
Sexual contact is the most common means of transmission in China, followed by mother-to-baby transmission and drug needle sharing, the Family Planning Commission said.