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Fourth case of bird flu reported in the U.S.: Colorado farm worker infected

 


A Colorado dairy worker has been infected with avian flu, the fourth case in an ongoing outbreak that began in cows this spring.

Colorado health officials said the man had mild symptoms and only complained of eye inflammation called conjunctivitis.

The Colorado Department of Public Health and Environment statement The man, who was given antiviral medication and recovered, said he worked on a dairy farm in northeastern Colorado where he had direct contact with dairy cows infected with H5N1, the virus that causes avian influenza.

Colorado health officials said they had provided personal protective equipment to the facility where the man worked.

“We are still collecting additional information regarding worker infections and PPE use,” state epidemiologist Rachel Herlihy said in a statement.

None of the farmworker's household contacts have symptoms and there is no evidence of person-to-person transmission, Herlihy said. State and local health officials are conducting follow-up investigations and will do additional testing if necessary, he said.

Two other dairy farmers have been infected. In April, a Texas dairy farmer Michigan Eye inflammation was also reported in May. Michigan's second worker The infected worker in late May complained of eye discomfort accompanied by a cough and watery eye discharge and was the first to report more widespread respiratory and eye symptoms.

Colorado health officials said the worker developed symptoms in late June, reported them the next day and was tested two days after his symptoms began. Initial tests were inconclusive. Additional testing by the Centers for Disease Control confirmed the presence of avian influenza.

A poultry worker in Colorado tested positive for the same strain of avian flu in 2022. Around the world, cases of illness in humans range from mild infections to more severe illnesses, including pneumonia.

Federal health and agriculture officials have repeatedly stressed the importance of dairy farmers taking precautions, such as having workers wear personal protective equipment when handling infected cows. Federal and state authorities have provided supplies to dairy farms but have not mandated their use.

Dairy workers usually milk the cows' teats by hand before attaching the milking machine. Contaminated milk can splash directly into the eyes or the virus can get into the eyes when the workers touch them with contaminated hands. Eye infections have been linked to past human infections with avian influenza.

Many public health experts say insufficient testing of cattle has hindered efforts to understand and control the outbreak, which was officially confirmed in March but may have been present in cattle since December.

A recent USDA study of H5N1 in 15 dairy herds and eight poultry herds in Michigan identified three risk factors for local spread: contaminated equipment or machinery, people who had the virus on their clothes or boots, and the animals themselves.

Federal health officials said this week that their risk assessment has not changed: While the threat to the general public remains low and dairy workers and others who come into contact with infected animals are at higher risk, U.S. officials are not recommending vaccination for any groups.

Earlier this week, federal officials announced plans to expand vaccine and testing capacity in preparation for the ongoing outbreak. Bird flu outbreak This could be because infection in dairy cattle leads to an increase in human infections, the virus mutates and becomes more transmissible or causes more severe disease, or cases occur that are not linked to infected herds or people.

The U.S. government has stockpiled 4.8 million doses of the avian influenza vaccine, which are expected to be available from mid-July. $176 million to Moderna Complete the development and testing of an mRNA-based vaccine against H5N1.

Sources

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2/ https://www.washingtonpost.com/health/2024/07/03/bird-flu-colorado-dairy-farm-worker/

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