North Queensland head coach Neil Henry and trainer Billy Johnstone have returned negative tests for swine flu.

The Cowboys released the information on Wednesday morning after the pair were quarantined as part of the NRL's swine flu health scare.

Queensland prop Ben Hannant's positive test has forced several State of Origin players and staff to be quarantined.

Henry was Queensland's assistant coach in the State of Origin series opener in Melbourne last week while Johnstone is the Maroons trainer.

The news means Henry, Johnstone and the Cowboys trio of Origin players Luke O'Donnell, Johnathan Thurston and Matt Scott will all resume normal duties with the club on Thursday.

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