麻疹病毒在细胞复制的过程中，很容易受自身因素或其他因素的影响。因此要制备一株病变发展较猛、滴度较高的毒种有一定难度。故以往在麻疹疫苗生产中，经常迂到疫苗滴度偏低的情况，严重制约着麻疹疫苗的生产。经过近两年来的探索，我们找到了能制备出优良麻疹疫苗毒种的好方 Measles virus in the process of cell replication, it is easy to be self-factors or other factors. Therefore, to prepare a strain of more aggressive, high titers have a certain degree of difficulty. Therefore, in the past, in the production of measles vaccine, it often leads to low vaccine titers, seriously restricting the production of measles vaccine. After nearly two years of exploration, we have found a good way to prepare a good measles vaccine species