Methylene blue injection has a stronger direct inactivation on VZV in vitro. When the injection was diluted from 1:16 to 1:128, which was obvious (P＜0.01 and P＜0.05). The MIC was 1:222, the IC50 was 1:135 and IC90 was 1:77. The results of microcellculture method showed when the injection was diluted from 1:16 to 1:64, it also effectively inhibited the proliferation of VZV in WISH continuous cell-lines (P＜0.01 and P＜0.05). The MIC was 1:95, the IC50 was 1:45 and the IC90 was 1:21.
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