Page "Sierra Vista, Arizona" Paragraph 47

In 2003, three more cases of leukemia were reported.

The Centers for Disease Control ( CDC ) was hesitant to investigate in depth, initially leaving the matter to state health departments, but became involved after the ADHS requested their assistance in the spring of 2003.

The CDC concluded two formal studies, in 2004 and 2006, with mixed results.

They did not discover any environmental causes for the increased incidence of leukemia, but they did note that they only tested four children with leukemia.

They cautioned that with such a small number of study participants, " any attempt to measure associations between environmental exposure and disease would be inherently suspect and not statistically appropriate.

" Biological samples were tested for 128 chemicals, with results showing average or below average levels for all chemicals except tungsten, styrene and PCB-52, which were above average.