11.   They traced the outbreak to a batch of unpasteurized apple juice that the company used in many of its fresh mixed fruit beverages.

12.   Health officials have traced an outbreak of hepatitis A to a busy seafood restaurant.

13.   Health workers traced the outbreak back to a gorilla found in the remote north of the central African nation, in the Ogooue-Ivindo province.

14.   Preliminary investigations by a U.S. research team have traced the outbreak to bacteria in vegetables cultivated near the main rivers north of San Salvador.

15.   Rosa Virginia Olaya, Maramag chief nurse, traced the outbreak to bacteria found in water samples from several village wells.

16.   The outbreak has been traced to a woman who died in early September, he said.

17.   The outbreak has been traced to the same oral vaccine that experts have used to eliminate the disease in many countries.

18.   The outbreak has been traced to a woman who died in early September, said Okat Lokach, acting director of health services.

19.   The outbreak was traced to the contamination of the city water supply by an abandoned reservoir which had been used as a public toilet by slum dwellers.

20.   The outbreak has been traced to a funeral, where an entire family had died, Ochola said.