Yuan Guoyong, a Microbiology Professor at Hong Kong University, led his team to test 452 people who had no coronavirus symptoms and who came to Hong Kong from Hubei Province. The team found that 17 people, or about 3.8 percent, had the coronavirus antibody already, which indicated that they had been infected in the past.
Using that ratio, Yuan’s team estimated that, in Hubei province, there could be 2.2 million people, out of a total population of 59 million, infected with the coronavirus.
As of June 9, The Chinese Communist Party reported only 68,135 cases of infection in Hubei.
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Excerpt in Chinese:
港大微生物学袁国勇教授率领的团队，对从湖北返港无症状的452名感染者进行检测，发现其中17人即3.8%有新冠病毒抗体，这一比例远远高于经核算检测确诊的患者。
袁国勇团队据此推算，在湖北5900万人口中，在疫情爆发期间，可能有220万人曾经感染了新冠病毒。
根据中国官方公布的截至6月9日的统计，湖北确诊感染人数为68135人。袁国勇团队推算的数字远远高于中国官方公布的数字。
Source: Radio France International, June 10, 2020
http://www.rfi.fr/cn/中国/20200610-港大研究-湖北省高达220万人曾感染新冠病毒