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(Re)infection of the previously immune increase the force of infection

Even assuming marked reductions in infectiousness of individuals with prior pertussis, their large number and relative connectedness means these ‘partially immune’ individuals contribute significantly to force of infection.

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Controlling Infectious Diseases
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Diseases
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Pertussis
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Reasons for persistence of Pertusis?
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Immunity to Pertussis wanes in adolescents and adults
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(Re)infection of the previously immune increase the force of infection
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Immunity afforded by natural infection or vaccine is short-lived
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Susceptibility to Pertussis infection continues throughout lifespan
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