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Cases are climbing but experts are optimistic it doesn't spell a repeat of the explosion of cases last winter. Learn more at Boston.com.

minimal. he called it very, very modest. >> tell that son of a [no audio] to get on a plane and take a look at what we've got in our backyard. >> reporter: louisiana governor bobby jindal toured the area today. he's pushing for permits to build protective sand berms and running up against golf governmental red tape. >> this is the day everybody was worried about. that day is here. >> reporter: the crude's carnage could extend well beyond louisiana's marshes, satellite images and noaa confirm a long tendril of light oil has now entered the powerful loop current. it could start washing...

washing up in the marshes near the mouth of the mississippi river and government scientists say a small portion has reached the so-called loop current which could take it to florida and up the east coast. kelly cobiella has the latest tonight from venice, louisiana. >> this is devastating. >> reporter: this is louisiana's nightmare: heavy black oil killing the grasses that make up these vital marshes. >> this is the monster that we're fighting. it's like a serial killer. it's just tough to track. >> reporter: p.j. hahn is the director of coastal management for plaquemines parish. he'...