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"Surveillance for Waterborne Disease and Outbreaks Associated with Recreational Water Use and Other Aquatic Facility-Associated Health Events --- United States, 2005--2006." Centers for Disease Control and Prevention. Centers for Disease Control and Prevention, n.d. Web. 29 May 2016.

The graphs above indicates waterborne diseases in the United States. Some of these illnesses were caused by “unidentified” agents.

What percent were known to have been caused by biological agents?

A

28.2%

B

43.6%

C

5.1%

D

76.9%

E

53.9%

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