TransmissionPertussis is spread by contact with airborne discharges from the mucous membranes of infected people, who are most contagious during the catarrhal stage..
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TransmissionPertussis is spread by contact with airborne discharges from the mucous membranes of infected people, who are most contagious during the catarrhal stage..
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TransmissionPertussis is spread by contact with airborne discharges from the mucous membranes of infected people, who are most contagious during the catarrhal stage..
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TransmissionPertussis is spread by contact with airborne discharges from the mucous membranes of infected people, who are most contagious during the catarrhal stage..
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TransmissionPertussis is spread by contact with airborne discharges from the mucous membranes of infected people, who are most contagious during the catarrhal stage..
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TransmissionPertussis is spread by contact with airborne discharges from the mucous membranes of infected people, who are most contagious during the catarrhal stage..
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TransmissionPertussis is spread by contact with airborne discharges from the mucous membranes of infected people, who are most contagious during the catarrhal stage..
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TransmissionPertussis is spread by contact with airborne discharges from the mucous membranes of infected people, who are most contagious during the catarrhal stage..
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