ATLANTA, Georgia (CNN) -- Authorities are doing everything possible to ensure samples of a killer influenza virus sent to more than 4,000 laboratories worldwide are destroyed before anyone becomes infected, a top U.S. disease expert says.
"While the risk of the situation is very low, we're not taking any chances and we're doing everything we can to make sure that there is no threat to human health," Dr. Julie Gerberding, director of the Centers for Disease Control and Prevention, told reporters at a news conference on Wednesday.
On September 10, the College of American Pathologists sent samples of the virus that caused the "Asian flu" pandemic of 1957 to laboratories in 18 countries, including the United States and Canada.
The pandemic killed more than 1 million people, including about 70,000 in the United States.
The samples, part of a package of pathogens sent to laboratories to test their ability to identify them, were last seen in nature in the United States in 1968, Gerberding said. Anyone born since then would presumably have no immunity to the virus, she said.
Authorities are still trying to determine how many laboratories got the samples of the virus, called Influenza A H2N2.
"We're working with officials in all of these countries to take the steps necessary to contain the problem," she said.
Those steps include identifying the panels that contain the virus and destroying those samples by heating them.
Routine disease surveillance so far has turned up no unusual patterns that might indicate the disease had spread in the United States, she said.
"While the risk of the situation is very low, we're not taking any chances and we're doing everything we can to make sure that there is no threat to human health," Dr. Julie Gerberding, director of the Centers for Disease Control and Prevention, told reporters at a news conference on Wednesday.
On September 10, the College of American Pathologists sent samples of the virus that caused the "Asian flu" pandemic of 1957 to laboratories in 18 countries, including the United States and Canada.
The pandemic killed more than 1 million people, including about 70,000 in the United States.
The samples, part of a package of pathogens sent to laboratories to test their ability to identify them, were last seen in nature in the United States in 1968, Gerberding said. Anyone born since then would presumably have no immunity to the virus, she said.
Authorities are still trying to determine how many laboratories got the samples of the virus, called Influenza A H2N2.
"We're working with officials in all of these countries to take the steps necessary to contain the problem," she said.
Those steps include identifying the panels that contain the virus and destroying those samples by heating them.
Routine disease surveillance so far has turned up no unusual patterns that might indicate the disease had spread in the United States, she said.