In Singapore, most people are Rhesus positive (A+, B+, O+, AB+), and only less than 1% of the population are Rhesus negative (A-, B-, O- and AB-). This Rhesus-negative blood type is found most commonly in Singaporean Indians (6%), compared to other racial groups (less than 1%).
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http://www.hmudq.edu.cn/zz/jy/UpFiles/news/201211/2012 ABO blood group 血液.pdf