Groups deemed necessary for "close monitoring", including international arrivals, are being subjected to four tests — a nasal swab, a throat swab, a blood test and an anal swab.
"Applying extra anal swabs can improve the detection rate of infection and reduce missed diagnosis," Li Tongzeng, associate director of respiratory and infectious diseases at Beijing's You'an Hospital, told state broadcaster Central Chinese Television (CCTV).
Douyacai, a student returning from South Korea, had her anal swab in Beijing on her 14th day of quarantine.
She wrote that the test was carried out by medical personnel with two swabs.
She wrote on her blog that the test was administered on her 12th day of quarantine in addition to an oral swab and she encouraged others to cooperate with medical staff.
"I'm not quite sure what they're trying to achieve here with all the anal swabs," Dr Sanjaya Senanayake, an infectious diseases expert at the Australian National University, told the ABC.
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