“Use really clean footwear and clothing when with your birds and minimise the number of people that have contact with them.
“Keep good rodent and pest control because they can carry the virus from dead birds”, she added.
Bird owners must follow strict biosecurity measures to limit the spread of the disease.
The restrictions include pet birds and those kept for racing, breeding or exhibitions.
Further testing is also underway, said Defra.
Avian flu is spread by close contact with an infected bird, whether it is dead or alive.