We found 14 dictionaries that define the word infectivity:

General (7 matching dictionaries)

1. infectivity: Merriam-Webster
2. infectivity: Collins English Dictionary
3. Infectivity, infectivity: Wordnik
4. infectivity: Wiktionary
5. infectivity: Dictionary.com
6. Infectivity: Wikipedia, the Free Encyclopedia
7. infectivity: TheFreeDictionary.com

Business (1 matching dictionary)

8. infectivity: Legal dictionary

Medicine (5 matching dictionaries)

9. infectivity: Merriam-Webster Medical Dictionary
10. Infectivity: MedTerms.com Medical Dictionary
11. online medical dictionary (No longer online)
12. infectivity: Medical dictionary
13. Infectivity: Drug Medical Dictionary

Miscellaneous (1 matching dictionary)

14. infectivity: Wordcraft Dictionary

(Note: See infective as well.)

Definitions from Wiktionary (infectivity) ▸ noun:  The ability of a pathogen to establish an infection Similar: infectability, infectibility, transfectivity, enteropathogenicity, infectant, infection, nephropathogenicity, cytopathogenicity, immunopathogenicity, hyperinfectiousness, more... Opposite: noninfectious, sterile, uncontagious Colors:     green,     yellow,     red,     orange,     lime, more... ▸ Words similar to infectivity ▸ Usage examples for infectivity ▸ Idioms related to infectivity ▸ Wikipedia articles (New!) ▸ Popular adjectives describing infectivity ▸ Words that often appear near infectivity ▸ Rhymes of infectivity ▸ Invented words related to infectivity