A strong immunity to reinfection develops after one year.
一年后能对再度感染产生强大免疫力。
More than 95% of cases are self-limited with clearance of virus and immunity to reinfection.
超过95%的病例是自限性清除病毒，并且对再次感染免疫。
More than 95% of cases are self-limited with clearance of virus and immunity to reinfection.
超过95%的病例是自限性清除病毒，并且对再次感染免疫。
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