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Survival curves for newborn mice after HCoV-OC43 infection. Newborn mice were infected intracerebrally with 103 HCoV-OC43 copies, and mother mice were treated subcutaneously with 1, 5, or 15 mg/kg chloroquine (CQ) prepartum (A) or postpartum (B). N represents the number of mother mice per group, and n represents the number of newborn mice per group.
