Some ducks fell sick and died of unknown causes, said Nguyen Duc Thang who owns the farm.

Local veterinarians took samples of the sick poultry for testing with the results showing the ducks had contracted the deadly A/H5N1 strain that causes bird flu.

Immediately the veterinarians culled all dead and infected ducks, and disinfected the farm and nearby areas in an effort to contain the outbreak.

This is the second time bird flu has been detected in Thang’s farm. The first outbreak was reported five years ago.

The veterinarians warned the weather conditions will be complicated in the coming months, posing a high risk of avian influenza A/H5N8 and H5N1. They suggested localities strengthen epidemic prevention and control, especially vaccination and disease surveillance.