What do I need?
I am going to Bangkok, Chiang Mai, Phuket, Penang, KL, and SIngapore. Thankyou

Nothing required, unless you've been to South America within a certain time of arrival in Malaysia and Thailand where you'll need yellow fever.

You'll be just fine.

About a week ago I read that parts of Asia Asia are currently experiencing a sharp rise in Malaria cases, you may want to check this out. Apparently it's a rather nasty type of Malaria as well.

Here is some information from the Australian Travellers Medical Vaccination Centre site.
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Malaria Information

In Thailand malaria risk exists throughout the year in rural, especially forested and hilly, areas of the whole country.
There is no risk in cities and the main tourist resorts (e.g. Bangkok, Chiangmai, Pattaya, Phuket). P. falciparum highly resistant to chloroquine and resistant to sulfadoxine-pyrimethamine reported. Resistance to mefloquine and to quinine reported from areas near the borders with Cambodia and Myanmar. (WHO)

The major risk areas include the border regions with Burma (Myanmar) and Cambodia, particularly during the monsoon season. Travellers off the beaten path are more at risk of exposure than the short term package traveller.

While travellers to the major urban areas of Chang Mai and Chang Rai may not require antimalarial prophylaxis it might be considered for those with overnight rural stays. It is important that travellers to this region alert their health care provider if they intend on overnight rural stays. This is even more important if travelling in the monsoonal months from July through to October. Travellers should also be aware of the signs and symptoms of malaria and that any illness - particularly ssociated with fever - must be considered to be malaria until proven otherwise.

Antimalarial advice is found in our section on recommended Products. Recommendations, however, must be made on an individual basis as certain medications may be contraindicated and living/travelling circumstances may vary considerably between individuals.

http://www.tmvc.com.au

Have a good time

Phoebe

You can always check the CDC Health Information for Travelers to Southeast Asia.

None required, it doesn't look like, but some are recommended by the CDC at least. Tetanus booster is a good idea in general if you're past 10 years on it, and Hepatitis A might not be a bad investment since southeast Asia lies in a 'high risk' zone. They recommend a typhoid vaccination, but I'm not sure how serious that actually is.

There's some others (hep B, Japanese encephalitis, rabies) recommended only under certain circumstances.