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| navigate by keyword : background biology case corona coronavirus covid disease ebola epidemic exponential exponentially figure flu graphic growth health illustration immune immunity immunization immunized immunology increase infection isolated measles medicine number outbreak pandemic probability quick rapid rate research rise sars science sick spread statistics study symbol theory time vector virus wave white |
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| Immune or immunized people can stop an epidemic. If the number of immune people is large enough, the virus can no longer spread. Exponential growth is stopped. Illustration on white background. Vector |
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