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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 ?
Accompanied by an infectiously energetic band and pulsating Afrobeats dancers that engage the crowd, Ayo's musical performance is steeped in the vibrancy of an authentic and worldwide sound.
DVDSwith Ian Bunting Unnecessary this sequel may have been, but it's still an infectiously fun watch.
DVDSwith Ian Bunting Unnecessary this sequel may have been but it's still an infectiously fun watch.
Digital Today Disc Monday The first half of this comedy is infectiously funny and left me in stitches, but a second-half overdose of mawkishness brought me out in a rash.
THE first half of this comedy is infectiously funny and left me in stitches, but a second half overdose of mawkishness brought me out in a rash.
Gospel music great, rhythm-and-blues icon, civil rights activist and all-around living legend Mavis Staples is celebrated with the infectiously joyful enthusiasm of a passionately devoted fan in "Mavis!," a spirited and captivating biodoc that richly deserves the exclamation point in its title.
The show did lull in the middle when Ezra took on a number of acoustic songs without his threepiece band, but the the infectiously catchy Budapest came at the perfect time before he brought the curtain down with an incredible cover of Cyndi Lauper's Girls Just Wanna' Have Fun and his new single Do You Hear The Rain?
Lovato performs some mostly innocuous and infectiously catchy pop songs.
Expect an assortment of jokes, stories, observations, ad-libs, oneliners, accents, theories, topical gags and self-deprecation from this infectiously charming and laid-back gag- smith.
But now audiences at the Muni Arts Centre in Pontypridd will have the chance to get up close and personal with this infectiously laid-back gagsmith and see for themselves why he's been named as one of Wales' most hotly tipped young performers.
Why not kick back in one of its comfortable booths while listening to infectiously toe-tapping music from the classic swing years?
And it's all because the Ollster wants to focus on racking up some more infectiously catchy No 1s and following his One Direction pals stateside.