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Btk is a bacteria found in the soil that is toxic only to caterpillars. When conducting gypsy moth eradications, WSDA almost always uses Btk because of its excellent safety for bees, birds, fish, pets, and people. 
Btk poses very little risk to human health. Learn more about what the Washington State Department of Health and others have to say about Btk and human health. 
Will Btk harm bees? What about my car? Get answers to the most frequently asked questions about Btk here.