This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. The ability of a pathogen to establish an infection

n. Tendency or capacity to infect; infectiousness.

"Prion infectivity is extremely resistant to degradation, resulting in an environmental persistence of infectious agent."

pathogenicity    behindthe    neuraminidase    causticity    re-creating