The highly contagious and deadly H7N8 strain of bird flu has been detected at a second farm in the Hawkesbury region, NSW's health minister says.

A poultry egg farm has gone into immediate lock down after a case of the highly contagious bird flu was detected in a second state.

Avian influenza has been found at a second egg farm in the Hawkesbury district.

Avian influenza has been found at a second egg farm in the Hawkesbury district.

Avian influenza has been found at a second egg farm in the Hawkesbury district.

A commercial farm in NSW is under lockdown after bird flu was found in chickens, although the strain is different to the outbreak impacting Victoria.

A commercial farm in NSW is under lockdown after bird flu was found in chickens, although the strain is different to the outbreak impacting Victoria.

A commercial farm in NSW is under lockdown after bird flu was found in chickens, although the strain is different to the outbreak impacting Victoria.

Hundreds of thousands of birds have been killed on a poultry egg farm after authorities detected bird flu on the property.

Bird flu has been detected at a commercial egg farm in Sydney.