The US Centers for Disease Control and Prevention recommend that most travellers to Myanmar receive the Hepatitis A and Typhoid vaccines before travelling, and suggest travellers consider Malaria prevention, Rabies vaccine, Japanese encephalitis vaccine and Hepatitis B vaccine.
There is no risk of Yellow Fever in Myanmar, but the government will require proof of vaccine if you are arriving from a country with risk of Yellow Fever virus transmission, such as from parts of Africa, Central and South America. Visit: wwwnc.cdc.gov for more information.