The data shows that the incidences were similar and high, while there remained virus-free strains. So it is rigorous to control their transmission for prevent virus-free strains from infection.
数据表明两者发病率相似皆较高，但皆有无毒品系存在，应严格控制其传播，避免无毒品系染病。
The data shows that the incidences were similar and high, while there remained virus-free strains. So it is rigorous to control their transmission for prevent virus-free strains from infection.
数据表明两者发病率相似皆较高，但皆有无毒品系存在，应严格控制其传播，避免无毒品系染病。
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