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caused by or capable of being communicated by infection.
infectious disease one due to organisms ranging in size from viruses to parasitic worms; it may be contagious in origin, result from nosocomial organisms, or be due to endogenous microflora from the nose and throat, skin, or bowel. See also communicable disease.

An emerging infectious disease is one that is endemic in a given population but that has begun increasing in frequency or developing resistance to drug therapy or other treatments.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


1. A disease capable of being transmitted from person to person, with or without actual contact.
2. Synonym(s): infective
3. Denoting a disease due to the action of a microorganism.
Farlex Partner Medical Dictionary © Farlex 2012


1. Capable of causing infection: an infectious microorganism.
2. Capable of being transmitted by infection: an infectious disease.
3. Capable of transmitting a disease; contagious: Is the patient still infectious?

in·fec′tious·ly adv.
in·fec′tious·ness n.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


1. Referring to an infection.
2. Capable of spreading infection–eg, expulsion of infected aerosol by coughing or sneezing.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.


1. Capable of being transmitted by infection, with or without actual contact.
2. Caused by infection of the body by pathogenic organisms; not a synonym for contagious.
Synonym(s): contagion.
Synonym(s): infective.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


1. Disease capable of being transmitted from person to person, with or without actual contact.
2. Synonym(s): infective.
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about infectious

Q. Is psoriasis infectious? Last week I and my friends from high-school went to the pool. One of my friend has psoriasis on his back, and when the lifeguard noticed it he asked him to leave the pool because he has skin disease that may spread to the other people swimming in the pool. We told him it is psoriasis and not some fungus, but he told us that psoriasis is also infectious. Is that true? Can psoriasis infect people who come in touch with people with psoriasis? Can I go swimming with him or should be more cautious?

A. It is right that psoriasis is not a contagious skin condition. But your friend should take care. However keeping skin humid is better for Psoriasis patients as I recently read these tips at

Q. Is leukemia contagious? A friend of mine got leukemia (blood cancer), can I get it from him if he bleeds and I touch the blood? Like HIV I mean.

A. No, you don't have to be afraid, no chance of that. Your friend will need you to pass this terrible illness. So I recommend learning a bit about leukemia so you understand it better and won't avoid your friend.
You can get information on those 2 sites:

Q. Is psoriasis contagious? My wife got psoriasis and I don’t want to get infected…

A. Psoriasis itself, as was written above, isn't contagious, i.e. if someone has psoriasis he or she can't transmit it to you. However, there is a form of psoriasis called psoriasis guttate that is associated with infection of the throat by a bacterium called streptococcus (which is contagious), so in some way it is contagious.

You may read more here:

More discussions about infectious
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References in periodicals archive ?
Global demand for infectious disease testing products in 2018 had applications extending into nine major segments:
A total of 326,524 cases were classified as Class B infectious diseases, resulting in 2,014 deaths.
"The cases we reviewed allowed us to identify a range of diseases, specific settings and activities that are at an increased risk for certain infectious diseases, and employee and workplace factors that often facilitate transmission of the disease," said Marie A.
The moot was preceded by a series of workshops which highlighted key areas regarding outbreak of infectious diseases, measures such as how to carry out infection management in hospitals, clean environment in patient's surroundings, misuse of antibiotics and important role of pharmacy in checking the unhindered use of antibiotics.
"Between 1980 and 2014, there were declines in mortality from most categories of infectious diseases, with large differences among U.S.
He has been the president of the Society of Infectious Diseases Pharmacists and has had leadership positions in other societies.
Most studies on infectious disease transmission using adaptive networks are deterministic.
The researchers analyzed all cases of youth under age 20 years with an infectious disease diagnosis who were included in the nationally representative Kids' Inpatient Database for 2000, 2003, 2006, 2009, and 2012.
There was need for better coordination between and within departments and service providers to make system harmonized and synergistic for all efforts to ensure control and prevent infectious diseases in the hospital for enhancing preparedness of MH for management of Infectious disease outbreak in any disaster.
May 28 (SeeNews) - Belgian molecular diagnostics company Biocartis (EBR:BCART) and Luxembourg-based infectious diseases detection company Fast-track Diagnostics announced Wednesday a strategic partnership to develop a range of multiplex infectious disease tests using the Biocartis Idylla system.
KUWAIT, Jan 16 (KUNA) -- Head of Infectious Diseases' Awareness-Raising Committee at the Ministry of Health Ghaliah Al-Mutairi underlined Kuwait has made inroads in controlling and eradicating most of the infectious diseases such as polio, tetanus and diphtheria, and others.

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