感染力

感染力（infectivity）为流行病学名词，指病原体感染宿主的能力。病原体的感染力一般与其毒力呈正相关^[1]。常用的感染力量化单位为ID50，即达到50%感染率所需的病原数量，其数值越低代表病原的感染力越高^[2]，不同病源的ID50差异很大，如痢疾志贺氏杆菌（英语：Shigella dysenteriae）的ID50为10，霍乱弧菌的ID50则为10⁶至10¹¹^[3]。

参见

致病性（Pathogenicity）：指病原体感染后造成临床可见症状的能力^[4]。

参考文献

^ Stewart, AD; Logsdon, JM; Kelley, SE. An empirical study of the evolution of virulence under both horizontal and vertical transmission. Evolution. April 2005, 59 (4): 730–739. PMID 15926685. doi:10.1554/03-330.
^ Wessels, Michael R.; Gama, João Alves; Abby, Sophie S.; Vieira-Silva, Sara; Dionisio, Francisco; Rocha, Eduardo P. C. Immune Subversion and Quorum-Sensing Shape the Variation in Infectious Dose among Bacterial Pathogens. PLoS Pathogens. 2012, 8 (2): e1002503. ISSN 1553-7374. doi:10.1371/journal.ppat.1002503.
^ van Seventer, Jean Maguire; Hochberg, Natasha S. Principles of Infectious Diseases: Transmission, Diagnosis, Prevention, and Control: 22–39. 2017. doi:10.1016/B978-0-12-803678-5.00516-6.
^ Lesson 1: Introduction to Epidemiology / Section 9: Natural History and Spectrum of Disease. CDC. 2012 [2021-03-18]. （原始内容存档于2021-03-18）.

[1] Stewart, AD; Logsdon, JM; Kelley, SE. An empirical study of the evolution of virulence under both horizontal and vertical transmission. Evolution. April 2005, 59 (4): 730–739. PMID 15926685. doi:10.1554/03-330.

[WesselsGama2012-2] Wessels, Michael R.; Gama, João Alves; Abby, Sophie S.; Vieira-Silva, Sara; Dionisio, Francisco; Rocha, Eduardo P. C. Immune Subversion and Quorum-Sensing Shape the Variation in Infectious Dose among Bacterial Pathogens. PLoS Pathogens. 2012, 8 (2): e1002503. ISSN 1553-7374. doi:10.1371/journal.ppat.1002503.

[van_SeventerHochberg2017-3] van Seventer, Jean Maguire; Hochberg, Natasha S. Principles of Infectious Diseases: Transmission, Diagnosis, Prevention, and Control: 22–39. 2017. doi:10.1016/B978-0-12-803678-5.00516-6.

[4] Lesson 1: Introduction to Epidemiology / Section 9: Natural History and Spectrum of Disease. CDC. 2012 [2021-03-18]. （原始内容存档于2021-03-18）.

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