In Colorado, the first human case of avian flu has been verified.

DES MOINES, Iowa (AP) — Although a Colorado jail prisoner tested positive for bird flu in the first recent verified instance of a person infected with the illness that has killed millions of hens and turkeys, federal authorities say the public is still not at risk.

The individual who tested positive had been in a prerelease programme and was assisting in the removal of hens from a contaminated farm, according to the US Centers for Disease Control and Prevention. The individual, who was under the age of 40, complained of weariness for a few days but has since recovered, according to state health and CDC authorities.

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The individual has been quarantined and is receiving antiviral treatment. Other workers participating in the Colorado bird eradication operation have tested negative, but they are being retested just in case.

According to Lisa Wiley, a spokesman for the Colorado Department of Corrections, "the offender was part of a prison work group made of convicts approaching release who had been working at the farm before a case of bird flu was discovered there on April 19." When bird flu was discovered on the farm in Montrose County, convicts were requested to assist in the slaughter and removal of the birds.

An epidemic has been identified on a Montrose County farm with 58,000 broiler breeder chicks, according to agriculture authorities.

Despite the illness, the CDC believes the risk to the general public is limited since the virus can only be transmitted to humans via intimate contact with an infected bird.

Multiple reports of viral infections in humans via bird exposure, or identification of transmission from one sick person to a close contact, might heighten the public health danger. The CDC is also looking for genetic alterations in the bird flu virus, which might signal that the virus is changing to transfer more easily from birds to humans or other animals.

Since late February, the current strain of avian flu, H5N1, has been spreading in backyard and commercial chicken and turkey flocks throughout the United States. Viruses have been discovered in 29 states in commercial and backyard birds, as well as 34 states in wild birds. According to the US Department of Agriculture, more than 35 million hens and turkeys have been slaughtered and removed to prevent the spread of the disease.

The Centers for Disease Control and Prevention (CDC) said it has followed the health of more than 2,500 humans who had been exposed to H5N1 virus-infected birds, but this was the first verified case.

According to the CDC, the guy may have just had the virus in his nose and not the rest of his body. Repeat influenza testing on the individual was negative, according to Colorado public health authorities. A positive nasal swab test result matches the agency's requirements for diagnosing an illness.

"At this point, the proper public health response is to presume this is an infection and take steps to control and treat it," the CDC stated in a statement.