New Orleans

In Louisiana, Mardi Gras comes each year with dozens of parades filled with marching bands, colorful floats and parade-goers who scream, "Throw me something, Mister!"

That "something" the crowd wants are beads. The goal of any Mardi Gras parade is to catch as many as possible. After the revelry, people often have so many beads around their necks they can barely turn their heads.

A 4-year-old child who died of a rare brain infection in early August has led Louisiana health officials to discover that the cause is lurking in the water pipes of St. Bernard Parish, southeast of New Orleans.