非洲健康研究所所长威廉·哈内科姆（Willem Hanekom）引用国家传染病研究所的数据和其他报告说 ： “ 目前，几乎所有的迹象都表明，这是一种较温和的疾病 。 ”
By quoting the data from National Institute of Infectious Diseases of South Africa and other reports, Willem Hanekom, Director of Africa Institute of Health said, “At present, almost all the evidence indicates that this is a relatively mild disease.”