RT Book, Section A1 Ryan, Kenneth J. SR Print(0) ID 1148671477 T1 Poxviruses T2 Sherris Medical Microbiology, 7e YR 2017 FD 2017 PB McGraw-Hill Education PP New York, NY SN 9781259859809 LK accessmedicine.mhmedical.com/content.aspx?aid=1148671477 RD 2024/10/10 AB You have erased from the calendar of human afflictions one of its greatest. Yours is the comfortable reflection that mankind can never forget that you have lived. Future nations will know by history only that the loathsome small-pox has existed.—Thomas Jefferson, Letter to Edward Jenner, 1806