COVID-19: Immunology, vaccines and epidemiology: Week 8: Figure 4 Map showing the date of the first identified alpha variant genomic sequence in different countries. Darker countries have earlier sample dates. This variant spread between September 2020 and May 2021.

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COVID-19: Immunology, vaccines and epidemiology

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Figure 4 Map showing the date of the first identified alpha variant genomic sequence in different countries. Darker countries have earlier sample dates. This variant spread between September 2020 and May 2021.

2.2 Origin and spread of variants

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