16. Volunteers with any of the following laboratory parameters at the screening visit (within 30 days of immunization): Hemoglobin <10 (without having received a blood or red blood cell transfusion within 30 days prior to laboratory test); neutrophil count <750 cells/mm3; platelet count <50,000/mm3; serum creatinine > 2.0 mg/dL; aspartate aminotransferase (AST) or alanine aminotransferase (ALT) > 3 times the upper limits of normal; total bilirubin > 1.5 mg/dL