Influenza Vaccine

Influenza can easily ruin one's trip. Knowledge of a new epidemic in the country to be visited may be sufficient to postpone the trip for high risk individuals. Influenza occurs all year round in the tropics. Pregnancy increases severity of illness. Other prevention & treatment options
see also WHO - www.who.int/ith/chapter05_06.html#influanza

Pneumococcal pneumonia Vaccine

About 10% of travellers acquire respiratory infections during their travels. Indications for this vaccine are the same as those for non-travellers: eg. those with heart or lung disease, the elderly, the immunocompromised.
Boosters every 5 years (NHMRC) - Literature insert very conservative.
see also WHO - www.who.int\ith\chapter06_11.html

Disease outbreaks: http://www.who.int/emc/outbreak_news/index.html