The Department's chief veterinary officer, Dr Ron Glanville, said routine tests were currently being conducted on a number of sick horses with a view to ensuring they are not Hendra affected.

"There's no doubt many horse owners are Hendra aware and there's been a modest increase in the number of people calling about possible testing," Dr Glanville said.

"The increased number of investigations is providing further assurance that this serious virus is not present in the general horse population across the state.

"Horse owners in our community are doing the right thing and calling Biosecurity Queensland if they have a concern about the health of their animal.

"Given the potential seriousness of the virus we are taking no chances and will ensure that any horse showing symptoms consistent with Hendra is tested."

Horses affected by Hendra may display a range of symptoms including a very high temperature and sudden onset of respiratory problems or neurological signs such as circling, unsteadiness or blindness.

"If you have a concern about your horse you should stay away from it and not hesitate to call because we are here to provide our expertise and support and to take action in cases of concern," Dr Glanville said.

Meanwhile State Primary Industries Minister Tim Mulherin says horse industry stakeholders, including the Horse Industry Council and the Australian Veterinarians' Association, will be sent draft terms of reference for the review of the latest cases of Hendra Virus.

"I am aware that there is a high level of public interest in Hendra, which is why I have asked for an independent review of the Department's emergency response," Mr Mulherin said.

"Queenslanders can be assured that this review will be properly focused and they can expect that those responsible will identify how and where improvements can be made.

"The draft Terms of Reference include a review of DPI&F's standard operating procedures, as well as standards for veterinarians about the handling of suspect Hendra virus cases.

"Workplace health and safety for DPI&F officers is also included."

Mr Mulherin said the processes required to appoint an independent consultant to head the review are underway and it's expected the services of an appropriately qualified person will be secured next week.

The consultant will be asked to report on the findings by the end of October 2008.

* Anyone with concerns about the health of their horse should contact: DPI&F on 13 25 23.