Are American Zika strains more virulent than Pacific and Asian strains?

Over recent years, Zika virus (ZIKV) has spread eastward from Africa and Asia, leading to an epidemic in the Americas. Now, researchers comparing American, Pacific and Southeast Asian subtypes of the virus in PLOS Neglected Tropical Diseases have concluded that the American-subtype strain has the highest ability to grow both in vitro and in vivo.

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