Not to be inj intravascularly, intradermally or IM. Anaphylactic reaction. Postpone vaccination in patients suffering from acute severe febrile illness. Anxiety-related reactions including vasovagal reactions (syncope), hyperventilation or stress-related reactions; chronic medical conditions. Wait at least 6 wk & preferably for 3 mth after vaccination in patients receiving Ig or Ig-containing blood products eg, blood or plasma. Review of medical history; continue personal protection measures against mosquito bites after vaccination. May affect ability to drive & use machines. Women of childbearing potential should avoid pregnancy for at least 1 mth following vaccination. Childn <4 yr.