The proportions of cases and controls were: 90.9% vs 93.9% against poliomyelitis, 92.7% vs 93.9% against DPT (diphtheria, pertussis, and tetanus), 63.0% vs 67.9% against measles, 40.0% vs 39.2% against rubella, 22.2% vs 35.4% against mumps, 25.9% vs 25.0% against MMR (measles, mumps, and rubella), 8.5% vs 12.6% against varicella, 68.9% vs 72.2% against Japanese encephalitis, and 93.5% vs 94.9% against tuberculosis (BCG). This evidence concerns the gene MRC1 and pertussis.