According to the CDC, the first human case of H5 bird flu in the United States was reported in a person in Colorado on Thursday. 

The person tested positive for the avian influenza A (H5) virus and was involved in the culling of chickens suspected of having H5N1 bird flu. The patient′s only symptom was weariness for a few days but had since recovered and had been isolated and treated with the influenza antiviral medicine oseltamivir.

Since the CDC began monitoring for disease among individuals exposed to the viruses in late 2021, H5N1 viruses have been discovered in commercial and domestic birds in 29 states and wild birds in 34 states. The CDC evaluated around 2,500 people who had been exposed to H5N1 virus-infected birds, but this is the only case that has been discovered thus far. Other people who participated in the Colorado culling operation were negative for H5 virus infection, but they are being retested as a precaution.

As per data from the CDC, this is the second human case worldwide linked to this particular group of H5 viruses, which is now prevalent. The first was reported in December 2021 in the United Kingdom.