Poultry farmers in the Netherlands were ordered on Tuesday to keep animals indoors until further notice due to new outbreaks of a highly contagious strain of avian influenza, Reuters reported, citing the government.

The decision followed the detection of a second case of avian influenza within a few days, on a farm just north of Amsterdam.

Last weekend the first case of the animal disease since July was detected, while last year more than 6 million birds in the country had to be culled after dozens of outbreaks.