During the middle ages, the doors of households suffering from the Black Death were marked with a red cross. It served as a warning: Do not enter, or ye shall suffer the fate of everyone inside.
What Is Contact Tracing, and How Can It Fight Pandemics?
During the middle ages, the doors of households suffering from the Black Death were marked with a red cross. It served as a warning: Do not enter, or ye shall suffer the fate of everyone inside.
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