the audio from the newsconference can be found here

http://www.mediafire.com/?ti2ojnymwsh

Kev discussed thsi in a blog post,
http://leftbrainrightbrain.co.uk/?p=1285

O’Leary doesn’t state that he knows the Wakefield samples were contaminated. As I recall, he gives that as a strong possiblity of why the samples gave false positives.

“I would like to put the record straight with respect to Dr. Gershon’s testimony last year on the molecular detection of measles virus in the laboratory of Professor O’Leary. Dr. Gershon’s was false in relation to a number of assertions, whether or not his testimony constituted perjury or simply sloppy science. It is not my wish to take up valuable time in this hearing with the details of Dr. Gershon’s unacceptable errors or correspondence relating to this. All raw data have been provided to both the ranking
majority and minority members. Merely by way of illustration, he stated that tissues from experimental animals and others infected with measles virus were positive in Professor O’Leary’s lab. In fact, they were all entirely and consistently negative on repeat testing in blinded studies. Scientifically, Dr. Gershon’s behavior was a disgrace and I stand by that. I would level the same charge at anyone who relies on or has relied on in any way upon his testimony. The disgrace is that he did not check the raw data before impugning the reputation of a fellow scientist before the eyes of the world.”

In other words, someone who had honestly told the committee that Oldstone had withdrawn cooperation with Wakefield and O’Leary after finding contamination in blinded samples, was subjected to abusive allegations of “perjury” from Wakefield. Wakefield went on to attack Gershon’s wife, alleging she had a conflict of interest over a chickenpox vaccine patent (she didn’t, but he had one over a measles vaccine patent).

I actually asked Oldstone about this, years back, and he confirmed Gershon’s account.

BTW, Sullivan, where did O’Leary talk about Wakefield’s samples being contaminated? You mention a press conference. Is there are record?