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In a Race Against an Ever-Changing Virus, Humans Losing Ground – WebMD

The virus behind COVID-19 is evolving fast enough that vaccination efforts may not be able to wipe it out.

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In some low-income countries, the prospect of herd immunity looks even more remote: Only about 1% of their populations have been vaccinated so far.
So why did scientists think herd immunity was ever possible? The first pictures of coronavirus suggested…

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