Blood disorders eg, thrombocytopenia or clotting disorders. Presented w/ febrile convulsion. Fever ≥40°C, collapse or shock-like state w/ hypotonic-hyporesponsive episode, persistent, inconsolable crying lasting ≥3 hr w/in 48 hr vaccination, convulsions (w/ or w/o fever) w/in 3 days of vaccination. Guillain-Barre syndrome or brachial neuritis. Concomitant use w/ corticosteroids, cytotoxic drugs, radiotherapy or other drugs that may weaken the immune system.