According to Hsu, disease control experts manufactured peptide vaccine with chemical synthesis techniques early on, but the small size of the molecules led to insufficient antibody titer, resulting in incomplete protection.
徐堯煇指出，早期防疫專家使用化學合成方法製作胜肽疫苗，由於分子很小，引起的抗體「力價」不夠，無法達到完全的保護效果。