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Geographic distribution and relation of the three human plague cases in Inner Mongolia and Beijing. Part A: vertical line area: Meriones unguiculatus plague focus; horizontal line area: Microtus brandti focus; slant line area: Spermophilus Dauricus focus; cross line area: overlap area between Meriones unguiculatus and Spermophilus Dauricus. Part B: map of plague focus types in China..
