The Catholic Weekly reports that claims were made last week that WYD workers had been allowed on the site, bypassing the biosecurity measures in place.
But in a note sent to Sydney priests last weekend, the WYD office said its personnel had not been at Randwick.
It said: "Only when the NSW Department of Primary Industries suggests it is safe to do so will WYD 2008 staff and/or contractors enter Randwick Racecourse."
"WYD 2008 is committed to complying with the State and Federal GovernmentsÂ’ advice on this issue."
The organisers described the outbreak of equine influenza is a "deeply unfortunate occurrence".
They insisted Randwick is the best venue for the Vigil and Final Mass because it offers the best line of sight viewing for up to 400,000 people. It also far better for transport than the alternative Sydney Olympic Park venue.
WYD 'didn't try to breach horse flu quarantineâ€™ (Catholic Weekly, 30/9/07)
LINKS (not necessarily endorsed by Church Resources)
World Youth Day 2008
Australian Jockey Club
Peter McGauran (Australian Parliament)
WYD prep "quarantine madness", Minister warns (CathNews, 25/9/07)
WYD at Randwick "square peg in round hole": McGauran (CathNews, 21/9/07)
WYD construction an equine flu risk: Randwick trainers (CathNews, 19/9/07)
WYD as big as the Olympics: Anglican Archbishop (CathNews, 19/9/07)
WYD gifts tax deductible (CathNews, 17/9/07)
Vic govt comes to WYD funding party (CathNews, 5/9/07)
WYD registrations exceeding expectations (CathNews, 4/9/07)
WYD stays at Randwick, Premier rules (CathNews, 31/8/07)