Figure. Map of California displaying sample collection sites for avian influenza testing, fall 2005–summer 2007. The casual risk category is represented by a square, recreational risk category by a star, and occupational risk category by a circle. Counties are abbreviated as follows: CC, Contra Costa; GLE, Glenn; KER, Kern; LA, Los Angeles; MRN, Marin; ORA, Orange; RIV, Riverside; SAC, Sacramento; SOL, Solano; YOL, Yolo.
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