A female staff member became sick yesterday and was admitted to a Brisbane hospital last night after tests confirmed she had contracted the potentially deadly virus.

Another worker at the Thornlands clinic was hospitalised with the virus on Wednesday.

Both contracted the disease while working closely with three infected horses, two of which had to be euthanised.

Redlands Veterinary Clinic owner David Lovell said the woman’s infection was devastating.

“She’s very concerned, we’re all very concerned,” he said.

“Everyone’s looking at each other thinking, who’s next? It’s a very worrying time.”

Dr Lovell said Queensland Health medical officer Brad McCall had visited the clinic this morning to speak to staff about their ill colleagues.

“He said both of them were comfortable and in the best hands,” Dr Lovell said.

“In both cases the symptoms were fever, headaches and drowsiness.”

The woman’s infection brings the number of people known to have contracted the Hendra Virus to six.

Of those, two people have died – horse trainer Vic Rail and a veterinary assistant in Mackay.

Twenty-five staff at the clinic and up to 25 other workers who came in contact with the horses – such as farriers and feed providers – have tested negative to the virus.

They will undergo a second round of tests on Tuesday.

Thirty-seven horses at the clinic that also tested negative to the virus will be tested again on Wednesday.

Dr McCall said the wider community should not be alarmed as there was no evidence of person-to-person transmission of the virus.