Though many of the earliest transgenic crops introduced traits with primary benefits going to growers, some of those crops also provide secondary benefits to consumer health.  Bt corn is such an example.  It is one of the most commonly grown transgenic crops in the world today.  It contains a gene from the soil bacterium Bacillus thuringiensis, which encodes for a protein that is toxic to certain members of the order Lepidoptera.  These include the common corn pests European corn borer (ECB, Ostrinia nubilalis), Southwestern corn borer (SWCB, Diatraea grandiosella), corn earworm (CEW, Helicoverpa zea), and corn rootworm (CRW, Diabrotica spp).  Bt corn is harmless to vertebrates and non-lepidopteran insects.