Wu Rong-tsun says that the main difficulty in manufacturing vaccines is in collecting and culturing the virus. Also, it is not easy to isolate the part of the virus which will produce an immune response.
陽明大學生物藥學研究所所長吳榮燦指出，疫苗製造的困難在於病毒蒐集、培養上的困難，以及具有特殊抗原性部份不容易被找到。