Federal health officials on Thursday called for more testing of employees on farms with bird flu after a new study showed that some dairy workers had signs of infection, even when they didn't report feeling sick.
Farmworkers in close contact with infected animals should be tested and offered treatment even if they show no symptoms, said Dr. Nirav Shah, principal director of the U.S. Centers for Disease Control and Prevention.
The new guidance comes after blood tests for 115 farmworkers in Michigan and Colorado showed that eight workers — or 7% — had antibodies that indicated previous infection with the virus known as Type A H5N1 influenza.
“The purpose of these actions is to keep workers safe, to limit the transmission of H5 to humans and to reduce the possibility of the virus changing,” Shah told reporters.
The CDC study provides the largest window to date into how the bird virus first detected in March in dairy cows may be spreading to people. It suggests that the virus has infected more humans than the 46 farmworkers identified in the U.S. as of Thursday. Nearly all were in contact with infected dairy cows or infected poultry.
Outside experts said it’s notable that the study prompted the CDC to take new action. Previous recommendations called for testing and treating workers only when they had symptoms.
“This is a significant move towards the assessment that these H5N1 viruses are a greater risk than the CDC estimated before,” said Dr. Gregory Gray, an infectious disease researcher at the University of Texas Medical Branch in Galveston.
Every additional infection in animals or humans gives the virus the chance to change in potentially dangerous ways, said Angela Rasmussen, a virus expert at the University of Saskatchewan in Canada.
“It shows yet again that we are not responding effectively to the H5N1 cattle outbreak in humans or animals and if we continue to let this virus spread and jump from species to species, our luck will eventually run out,” Rasmussen said in an email.
The CDC study included 45 workers in Michigan and 70 in Colorado tested between June and August. Of the eight workers with positive blood tests, four reported no symptoms. All eight cleaned milking parlors and none used respiratory protection such as face masks. Three said they used eye protection.
High levels of the virus have been found in the milk of infected cows, increasing the risk of exposure and infection, researchers said.
Researchers said that efforts to monitor dairy workers for illness have been hindered by several barriers including the reluctance of farm owners and farmworkers to allow testing.
Rasmussen and others have criticized the federal response to the outbreak as too slow and “lackluster.”
“These studies should have been performed months ago and should have been prioritized,” she said.
The virus has been confirmed in at least 446 cattle herds in 15 states. Last week, the Agriculture Department said a pig at an Oregon farm was confirmed to have bird flu, the first time the virus was detected in U.S. swine.
The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Science and Educational Media Group. The AP is solely responsible for all content.
This colorized electron microscope image released by the National Institute of Allergy and Infectious Diseases on March 26, 2024, shows avian influenza A H5N1 virus particles (yellow), grown in Madin-Darby Canine Kidney (MDCK) epithelial cells (blue). (CDC/NIAID via AP)
LAS VEGAS (AP) — The person inside the Tesla Cybertruck that burst into flames outside President-elect Donald Trump’s Las Vegas hotel suffered a gunshot to the head before the explosion, officials said Thursday.
Clark County Sheriff Kevin McMahill said at a news conference that a handgun was found at the feet of the man who's been identified as Matthew Livelsberger. Officials believe the shot was self-inflicted.
Livelsberger served in the Green Berets, highly trained special forces who work to counter terrorism abroad and train partners, the Army said in a statement. He had served in the Army since 2006, rising through the ranks with a long career of overseas assignments, deploying twice to Afghanistan and serving in Ukraine, Tajikistan, Georgia and Congo, the Army said.
He was awarded two Bronze Stars, including one with a valor device for courage under fire, a combat infantry badge and an Army Commendation Medal with valor. Livelsberger was on approved leave when he died, according to the statement.
The FBI said Thursday in a post on X that it was “conducting law enforcement activity” at a home in Colorado Springs related to Wednesday's explosion but provided no other details.
The explosion of the truck, packed with firework mortars and camp fuel canisters, came hours after 42-year-old Shamsud-Din Bahar Jabbar rammed a truck into a crowd in New Orleans’ famed French Quarter early on New Year’s Day, killing at least 15 people before being shot to death by police. That crash was being investigated as a terrorist attack. The FBI said Thursday that they believe Jabbar acted alone, reversing its position from a day earlier that he likely worked with others.
Both Livelsberger and Jabbar spent time at the base formerly known as Fort Bragg, a massive Army base in North Carolina that is home to multiple Army special operations units. However, one of the officials who spoke to the AP said there is no overlap in their assignments at the base, now called Fort Liberty.
Chris Raia, FBI deputy assistant director, said Thursday that officials have found ‘no definitive link’ between the New Orleans attack and the truck explosion in Las Vegas.
Seven people nearby suffered minor injuries when the Tesla truck exploded. Video showed a tumble of charred fireworks mortars, canisters and other explosive devices crowded into the back of the pickup. The truck bed walls were still intact because the blast shot straight up rather than to the sides.
Tesla CEO Elon Musk said Wednesday afternoon on X that “we have now confirmed that the explosion was caused by very large fireworks and/or a bomb carried in the bed of the rented Cybertruck and is unrelated to the vehicle itself."
"All vehicle telemetry was positive at the time of the explosion,” Musk wrote.
Musk has recently become a member of Trump’s inner circle. Neither Trump nor Musk was in Las Vegas early Wednesday. Both had attended Trump’s New Year’s Eve party at his South Florida estate.
Authorities know who rented the truck with the Turo app in Colorado, Kevin McMahill, the elected sheriff of Clark County, which includes Las Vegas, said Wednesday. He did not release the person’s ID, however.
Copp, Richer and Long contributed from Washington.
Investigators enter a townhouse in northeastern Colorado Springs, Colo., Thursday, Jan. 2, 2025, as the investigation connected to the explosion of a Tesla Cybertruck outside President-elect Donald Trump's Las Vegas hotel continues. (Christian Murdock/The Gazette via AP)
Investigators stand outside a townhouse complex in northeastern Colorado Springs, Colo., Thursday, Jan. 2, 2025, as the investigation connected to the explosion of a Tesla Cybertruck outside President-elect Donald Trump's Las Vegas hotel continues. (Christian Murdock/The Gazette via AP)
Police block the area after a vehicle caught fire and exploded outside the lobby of President-elect Donald Trump's hotel Wednesday, Jan. 1, 2025. (AP Photo/Ty ONeil)
Police block the area after a vehicle caught fire and exploded outside the lobby of President-elect Donald Trump's hotel Wednesday, Jan. 1, 2025. (AP Photo/Ty ONeil)
Police block the area after a vehicle caught fire and exploded outside the lobby of President-elect Donald Trump's hotel Wednesday, Jan. 1, 2025. (AP Photo/Ty ONeil)
Police block the area after a vehicle caught fire and exploded outside the lobby of President-elect Donald Trump's hotel Wednesday, Jan. 1, 2025. (AP Photo/Ty ONeil)
