George Washington Carver

===Voice pitch===
Even as an adult Carver spoke with a high pitch. Historian Linda O. McMurry noted that he "was a frail and sickly child" who suffered "from a severe case of [[whooping cough]] and frequent bouts of what was called [[croup]]".<ref name=McMurry14/> McMurry contested the diagnosis of croup, holding rather that "His stunted growth and apparently impaired vocal cords suggest instead tubercular or [[pneumococcal]] infection. Frequent infections of that nature could have caused the growth of [[polyps]] on the [[larynx]] and may have resulted from a gamma globulin deficiency.&nbsp;... until his death the high pitch of his voice startled all who met him, and he suffered from frequent chest congestion and loss of voice."<ref name=McMurry14>{{cite book|title=George Washington Carver: Scientist and Symbol | author=Linda O. McMurry | publisher=Oxford University Press|page=14| year=1981}}</ref>