H7N9 mutated strain H7N9变异株
H7N9病毒属甲型流感病毒(influenza A virus)，其主要特征之一就是容易发生基因重配和突变(genetic reassortment and mutation)。有些突变可能导致病毒对人的感染力、毒力以及人际传播能力(human-to-human transmissibility)的增强，因此病毒变异问题一直备受关注。
The H7N9 mutated strain was found in January in two people who had contracted H7N9 bird flu in Guangdong.
1月，广东省在两例人感染H7N9禽流感病例中发现了H7N9变异株。
