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COLLINGWOOD'S Harry O'Brien has had a severe allergic reaction to antibiotics that resulted in the defender needing emergency adrenaline shots.

The Daily Telegraph reports that O'Brien's reaction - an anaphylactic shock that can be life-threatening -  happened after he fractured his finger at training.

O'Brien said he could see "bone and fat" protruding from his finger after a marking incident. He was treated by a club doctor.

"Because it was an open wound they stitched me back up and gave me some antibiotics that I had a reaction to and I went into anaphylactic shock [on Thursday]," O'Brien said.

"I was just eating my lunch [at the club] and couldn't stop coughing or sneezing. I stood up and started walking and walked past a few of the boys and they said: 'What's wrong with you?'

"And that's when I realised I was in a bit of trouble and couldn't breathe. The doc had left and one of the physios chased him down and took me across to his clinic so they could give me some adrenaline.

"I was pretty green and really out of it. Lucky they got me in on time.

"It was [frightening]. I could feel myself getting worse and worse. My chest felt like it was just caving in. I was in a bit of trouble [Wednesday] but feeling good [now and] I am fine [to play]."