There are a lot of countries in South East Asia, so it�s hard to know exactly what you would need � it will depend on where you visit. ]For example, Vietnam suffers from:
Malaria, Dengue fever and Japanese encephalitis. Care should be taken to avoid mosquito bites. Typhoid is a problem in the Mekong Delta.
Best bet is try the (slow) department of health�s website which has health advice for travellers..
www.doh.gov.uk/traveladvice/tables.htm