Severe Pertussis is 1.5 times more likely if poor vitamin D receptor – Feb 2016 | VitaminDWiki
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Whooping cough - Wikipedia
Pertussis
This Podcast Will Kill You - The Girl with the Whooping Cough premiered on Broadway April 25, 1910. From Wikipedia: "The story follows the misbehaviors of Regina (Valeska Suratt) as she passes