during the period 1981-1983 , 19 cases of guillain-barre syndrome ( gbs ) occurred in residents of larimer county , colorado , for an incidence of 4.0 cases per 100,000 population per year , compared with 1.2 cases per 100,000 per year in 1975-1980 ( p less than 0.05 ) .
C3829327
larimer county
C0009399
colorado