Brazil began a 28-day bird flu observation period on Thursday which it hopes will show the country's chicken farms are free of the disease after local authorities said a farm where its first outbreak was detected had been fully disinfected.

Brazil initiated a 28-day observation period to confirm its chicken farms are bird flu-free after a recent outbreak in Montenegro was reportedly disinfected. Authorities remain vigilant due to the virus's two-week incubation period,

Brazil is still analyzing a new suspected case of bird flu on a commercial poultry farm, raising concerns the deadly virus may be spreading in the world’s largest chicken exporter.