The results of tests on a vet who became ill after working on the Suffolk bird flu outbreak may be known later.
The man, who has not been named, is suffering from a "mild respiratory illness" at Nottingham's City hospital.
The hospital said in a statement his condition was "causing no immediate concern" and that he had been admitted as a precautionary measure.
Almost 160,000 turkeys were culled after the outbreak on a Bernard Matthews farm in Holton.
'Seasonal flu'
Nottingham University Hospitals said the vet, who works for the State Veterinary Service, was admitted after complaining of "mild non-specific symptoms".
There was no risk to other patients in the hospital, it said.
The Health Protection Agency said it was "highly unlikely" the man would have been contaminated because everyone involved would have taken antiviral drugs and worn "full protective clothing".
The HPA's Dr John Watson said: "It should be remembered that chest infections and fevers are common at this time of year when ordinary seasonal flu circulates."
The Strategic Health Authority in East Anglia said there was no need to panic.
The H5N1 strain - which has caused dozens of human deaths in Asia - was found in the turkeys on the farm.
The H5N1 virus does not pose a large-scale threat to humans because it cannot pass easily from one person to another.
However, experts fear the virus could mutate at some point in the future and trigger a flu pandemic, potentially putting millions of human lives at risk.
A 3km (1.9 mile) protection zone and a 10km (6.2 mile) surveillance zone are in place around the Holton farm.
Poultry owners in a wider restricted zone, covering 2,090 sq km (807 sq miles) around Holton, have been told to keep their flocks isolated from wild birds.
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