challenge

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challenge

 [chal´enj]
1. to administer a chemical substance to a patient for observation of whether the normal physiological response occurs.
2. in immunology, to administer antigen to evoke an immunologic response in a previously sensitized individual.
3. the administration of such a substance in order to assess for a response; called also provocation.
bronchial challenge (inhalational challenge) bronchial challenge test.

challenge

(chăl′ənj)
n.
Immunology The induction or evaluation of an immune response in an organism by administration of a specific antigen to which it has been sensitized.
v. chal·lenged, chal·lenging, chal·lenges
v.tr.
Immunology To induce or evaluate an immune response in (an organism) by administering a specific antigen to which it has been sensitized.

chal′lenge·a·ble adj.

challenge

Immunology The administration of an antigen or allergen to a person who has been previously exposed to the antigen, specifically to evoke an immune response
References in periodicals archive ?
Now he's the new face of Blockbusters each weekday on Challenge TV following in the footsteps of the late Bob Holness.Bob presented the game show from Your weekend 1983 to 1994 and it has now Simon is at the helm.
Not that aficionados will want Challenge TV to ever get embroiled again.
And - as the Sunday Mercury revealed last week - she has also just landed her first break in television as a hostess for Endurance UK, on Challenge TV. Filming for the show - a home-grown version of the notorious Japanese series - begins this week.
I see Challenge TV is showing some of the series again, with of course Mr Bob Monkhouse, the governor of stand up comedy and top game show host.
CLEVER students from Bangor will be aiming to win through to the semi-final of the University Challenge TV show.
? Blockbusters continues on weekdays on Challenge TV FORGET the Olympics, the Queen's Jubilee and Euro 2012, there's one event this year that's set to eclipse all of those in its sheer level of camp revelry, let alone drama and politics - the Eurovision Song Contest.
All New Blockbusters Nightly from Monday, Challenge TV, 8pm It was the staple TV diet of many a burgeoning intellectual, watching tea time telly in their school uniform in the 1980s.
INSPIRATION Nadine and Ivan with Sebastian DOUBLE CHALLENGE TV Presenter Ben Shephard will take part in the gruelling feat
Jean has also worked on the Disney Channel and was the face of the National Lottery Daily Play on Challenge TV.
A MIDLAND firm which claims to sell the world's hottest curry is to challenge TV chef Gordon Ramsay to try the dish at the Good Food Show.
He also has a competitive nature, loves watching Challenge TV and always wants to be a winner.
If sometimes dismissed as a naff '80s dinosaur in our hi-tech age, it was successfully resurrected this spring on the satellite channel, Challenge TV.

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