The key reason for the slowness of vaccine development is that animal research takes a long time. First of all, there are insufficient facilities for experimentation, and second, the law requires that research into notifiable diseases can only be carried out by the Animal Health Research Institute in Danshui. Hence the "traffic jam" is nothing new.
而疫苗發展之所以緩慢，關鍵在於動物實驗的速度太慢，一來沒有足夠的機構可以做實驗，二來法定傳染病更規定只能在農委會位於淡水的「家畜衛生試驗所」進行，因此「塞車」的情況屢見不鮮。