Japanese encephalitis

Consider vaccination if staying a month or more on Bali, Irian Jaya, Java, Kalimantan, Lombok, Mollucas, Nusa Tenggara or Sulawesi, especially if travel includes rural areas. Also consider if staying less than 30 days and at high risk (in case of epidemic outbreak or extensive outdoor
exposure in rural areas). While transmission likely occurs all year and varies by island, peak risk is generally from November to March, although it is June to July in some years. Human cases have historically been reported only on Bali and Java.
one-time booster dose is recommended for travelers who have previously completed a standard course of polio immunization. Refer to CDC guidelines for vaccinating unimmunized or incompletely immunized persons. Pregnancy is a relative contraindication to vaccination; however, if protection is needed, either IPV or OPV may be used, depending on preference and time available.