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@@ -7,6 +7,7 @@ B:Average birth rate
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M:Infants with passive immunity
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δ:Average time of temporary immunity
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1/ε:Average incubation time
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+Vac:Vaccine development duration
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Hp:Level of previous health status of the population
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rIm:Collective Immunity Ratio
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PoVp:Poverty level of the population
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