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Related to infectivity: antigenicity, toxigenicity


Capable of producing infection; infectious.

in·fec′tive·ness, in′fec·tiv′i·ty n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (Pathology) capable of causing infection
2. a less common word for infectious
inˈfectively adv
inˈfectiveness, ˌinfecˈtivity n
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ɪnˈfɛk ʃəs)

1. communicable by infection, as from one person to another or from one part of the body to another.
2. causing or communicating infection.
3. tending to spread quickly and generally: infectious laughter.
4. Obs. diseased.
in•fec′tious•ly, adv.
in•fec′tious•ness, n.
syn: See contagious.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.infective - able to cause disease; "infective agents"; "pathogenic bacteria"
unhealthful - detrimental to good health; "unhealthful air pollution"; "unhealthful conditions in old apartments with peeling lead-based paint"
2.infective - caused by infection or capable of causing infection; "viruses and other infective agents"; "a carrier remains infective without himself showing signs of the disease"
infected, septic - containing or resulting from disease-causing organisms; "a septic sore throat"; "a septic environment"; "septic sewage"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


[ɪnˈfektɪv] ADJ [disease, agent] → infeccioso
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005


adj (Med) agentinfektiös; infective diseaseInfektionskrankheit f
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
References in periodicals archive ?
According to the results of our study, a lower incidence of infectivity was observed in these areas compared to the infectivity incidence rate (74%) reported from neighboring provinces with the same climate and geographical characteristics (21).
In vitro and in vivo assays can be used to look for evidence of infectivity in a living system, while electron microscopy (EM), polymerase chain reaction (PCR)-based methods, and immunoassays look for viral markers, including the presence of virus particles, the virus genome, viral proteins or enzyme activity (see Figure 1).
'Hepatitis B is deadlier than HIV because of its infectivity; if Hepatitis B virus is on a surface, it can last on that surface for months.
In the Belgium-based study, target enrollment is 96 total subjects with the primary endpoint being influenza infectivity in the placebo group compared to the group vaccinated with M2SR.
Infectivity is most often found in the central nervous system, specifically the brain, spinal cord, and eye.
The infectivity of nematodes against larvae, after treatment with all the pesticides/biopesticides, was examined by using the 1:1 sand-well bioassay (Grewal et al., 1999) in 24-well plates.
Protein misfolding cyclic amplification (PMCA) is believed to mimic prion replication in vitro, but in an accelerated form, which enables amplification of minute amounts of [PrP.sup.Sc] and prion infectivity (9).
This study was the first to report that C psittaci could survive and has infectivity at 56[degrees]C for 72 hours.
Another letter sent in 1982 from the Oxford Haemophilia Centre to all haemophilia centre directors in England raised concerns about the effectiveness of testing blood for "infectivity" on chimpanzees.