| an outbreak of hepatitis a associated with green onions. | forty-three cases of serologically confirmed hepatitis a occurred among individuals who ate at restaurant a in ohio in 1998. serum samples from all restaurant a employees who worked during the exposure period were negative for igm antibodies to hepatitis a virus (hav). a matched case-control study determined that foods containing green onions, which were eaten by 38 (95%) of 40 case patients compared with 30 (50%) of 60 control subjects, were associated with illness (matched odds ratio, 12.7; 95 ... | 2001 | 11262211 |