Although less common than Salmonella or Campylobacter, Shigella is a significant cause of foodborne disease. Shigella is responsible for 10% to 20% of cases of bacterial foodborne illness each year in the United States.
A century later, it continues to be a marvel in modern engineering. The LA Aqueduct brought water from the Owens Valley hundreds of miles away to a growing area in need of additional resources to sustain its people and their endeavors, helping spur an economy that today rivals that of many nations.
Grass Valley, which was originally known as Boston Ravine and later officially named Centerville, dates from the California Gold Rush, as does nearby Nevada City. When a post office was established in 1851, it was renamed Grass Valley the following year for unknown reasons.The town incorporated in 1860.rass Valley is the location of the Empire Mine and North Star Mine, two of the richest mines in California.