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Maternal transfer antibody protects suckling mice from challenged with circulating recombinant strain in vivo. The neutralizing titer against G10 of maternal mice was tested in 3 time point: suckling mice born, challenge and end of observation. The • indicates high dose group (0.500 μg); the ▪indicates middle dose group (0.125 μg); the ▴ indicates low dose group (0.031 μg); the ▾ indicates PBS group.
