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an allergen capable of inducing delayed contact-type hypersensitivity of the epidermis after one or more episodes of contact.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


Any of a heterogeneous group of allergens that elicit manifestations of delayed hypersensitivity (that is, allergic contact dermatitis after direct contact with skin or mucosa).
Farlex Partner Medical Dictionary © Farlex 2012


Any of a group of allergens that elicit manifestations of induced sensitivity by direct contact with the skin or mucosa.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


Any allergen that elicits manifestations of hypersensitivity by direct contact with skin or mucosa.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

Patient discussion about contactant

Q. Contact lenses I’m 17 years old girl, and I have glasses since third grade. I never had any real problems with wearing them,. my best friend always encourage me to try contact lenses, but it seems so strange to put something on directly on your eyes- is it safe? How difficult is it to do?

A. Consult your ophthalmologist (eye doctor) before you decide.

Q. i have been in contact with someone whose in contact with bacterial meningitis. is this dangerous?

A. bacterial meningitis is one of the most lethal infections known. when people get infected by it they get a __ load of antibiotics and so are their families. but it all depends on what stage you had contact, and how close contact. in any way- he is probably under treatment now, no? if so, contact the doctors where he is hospitalized and ask them what is the protocol.

Q. for how long can i use my eye contacts with out harming my eyes? can i go to bed with it?

A. It is very much advised NOT to sleep with contacts, because of higher risks for eye infections that can be very dangerous. You shouldn't wear your eye contacts longer than a full day of work, and remove them when resting.
More discussions about contactant
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References in periodicals archive?
In all the patients, clinical relevance of positive allergens was determined based upon the history and examination to isolate all the probable contactants.
Le client peut desormais consulter la facture de consommation sur le site [beaucoup moins que][beaucoup plus grand que] en contactant le centre d'appels telephoniques 3002 pour obtenir le mot de passe, a indique M.
Des negociations economiques transformees en une affaire politique L'affaire, restee jusque-la dans le cadre de negociations economiques, s'est transformee des lors en une affaire politique lorsque le president francais, Georges Pompidou, s'est directement saisi du dossier en contactant le president Boumediene a travers Reda Malek, alors ambassadeur d'Algerie a Paris.
Celui-ci comptait ramener son propre staff, en contactant Madoui, son adjoint a l'ESS, et Benameur, entraEneur des gardiens de but.
Mais, surtout, l'obligation d'agir vite, en contactant les parents, le medecin traitant, ou l'association, en cas d'urgence.