A pool of disinfectant has collected at the gate to the Guangzhou Kwangfeng Industrial Company where vehicles are hosed down before being allowed to enter.
Those entering on foot pass along a 20-metre corridor covered by gunny sacks soaked in disinfectant that leads to the staff living quarters.
Further away, an iron gate closes off an inner compound where chickens are raised.
Only staff are allowed to enter this inner sanctum and only after they have showered, washed their hair and changed their clothes and shoes.
'Our workers and technical experts go in twice a day and each time they have to go through the disinfection process,' said a management spokesman.
'The rest of us are confined to this living area and we are allowed to leave the farm only once a month.'
The farm supplies 1.5 million live chickens and several hundred thousand frozen birds to Hong Kong each year. Employees are quarantined in its living quarters for two days each time they leave the farm before they can re-enter the chicken area.
