Salmonella: March 2012

August 1, 2012

In early March 2012, federal officials learned of infections from Salmonella Bareilly, bacteria that can cause diarrhea, fever and abdominal cramps if eaten in contaminated food. Left untreated, the illness can lead to death in high-risk populations, such as infants, older adults, and pregnant women.

Since then, about 250 people have been infected in 24 states and the District of Columbia, according to the Centers for Disease Control and Prevention (CDC).

The source of this outbreak is no longer a mystery, thanks in part to the efforts of the Food and Drug Administration’s (FDA) special urgent-response unit—the Incident Management Group (IMG). “The IMG serves as the agency’s focal point for coordinating emergency response activities,” says Ellen Morrison, director of the agency’s Office of Crisis Management.

The IMG operates out of the high-tech Emergency Operations Center (EOC) at FDA headquarters in Silver Spring, Maryland, and shifts into high gear when an emergency arises. The group’s composition varies according to the type of emergency, which could be an outbreak or a different kind of crisis.

“For the Salmonella outbreak, we assembled more than 30 agency experts in the EOC from offices across the agency to investigate the outbreak and track down its source,” says Mark Russo, director of FDA’s Office of Emergency Operations, a component of the crisis-management office directed by Morrison.

Prime Suspect

In the end, the prime suspect was a frozen raw yellowfin tuna product, called Nakaochi Scrape, imported from India. This tuna is used to make sushi, and many of the people who became ill reported eating sushi, with spicy tuna a common ingredient.

The road to that conclusion was long and winding.

And the journey actually started with FDA’s Coordinated Outbreak Response and Evaluation Network (CORE). This branch of FDA—on the frontlines of response to outbreaks of foodborne illness—evaluated and monitored the initial reports.

When the size, scope, severity and complexity of an outbreak require more staff and greater coordination, CORE may elevate the response to the IMG level and work from the EOC with colleagues from other parts of the agency and CDC.

Beginning on April 2, 2012, and for the next three weeks, Russo says, FDA experts on such subjects as outbreak investigation coordination, epidemiology, public and environmental health, food safety, seafood, imported products, legal issues, and cartography scrutinized thousands of pages of invoices, shipping records and bills of lading.

“There were probably hundreds of dedicated people from the FDA and other federal, state, and local agencies trying to pinpoint the outbreak’s cause,” Russo says. CDC worked with state and local public health officials to coordinate the epidemiologic aspects of the investigation, analyzing data that includes information on the cases, their distribution, and risk factors.

Meanwhile, local and state health agencies continued to interview people who had become ill. “But you’d be surprised,” Morrison says, “Not everyone has accurate recall when it comes to exactly what they ate on a certain date and where.”

By early April, CDC had identified six clusters of cases around restaurants or grocery stores in five states. Interviews suggested that the common food consumed and likely source of infection was sushi made with raw tuna—and specifically, spicy tuna.

This was just the beginning. “We needed to keep narrowing the focus down,” Morrison explains. “These groceries and restaurants may have used the same supplier or distributor. They may have used the same packager or manufacturer.”

After analyzing reams of data, the IMG selected and mapped four of the clusters of illnesses in Connecticut, Rhode Island, Texas, and Wisconsin as the investigation’s focus. Further analysis verified that all four had received the same imported, frozen raw Nakaochi Scrape tuna product from a single tuna processing facility in India.

With the source identified, FDA quickly alerted consumers and health agencies to the potential dangers of eating the recalled product. FDA provided information on symptoms of illness, at-risk populations, and precautions consumers can take in the future.

The company that imported the tuna from India—Moon Marine USA Corporation of Cupertino, California—voluntarily recalled the product.

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