People from most countries can visit Singapore as a tourist without needing a visa. The nationals of the European Union, Norway, Switzerland and the United States are allowed 90 days visa-free stay in Singapore.
Nationalities requiring visa
As of time of writing (August 2012), citizens of the following countries will need a visa. If you are a national of these countries, you must obtain your visa in advance, before arriving in Singapore.
Afghanistan
Algeria
Armenia
Azerbaijan
Bangladesh
Belarus
China
Egypt
Georgia
Hong Kong
India
Iran
Iraq
Jordan
Kazakhstan
Kyrgyzstan
Lebanon
Libya
Macau
Moldova
Morocco
Myanmar
Pakistan
Palestinian Authority
Russia
Saudi Arabia
Somalia
Sudan
Syria
Tajikistan
Tunisia
Turkmenistan
Ukraine
Uzbekistan
Yemen
Having a visa does not automatically gain you entry into Singapore. The Immigration & Checkpoints Authority has the final say at the Singapore checkpoint whether or not to allow entry, judging each on a case-to-case basis.
If most cases, you do not need a vaccination for entering Singapore. The only instance you would need a vaccination is if you were in a country where yellow fever is endemic up to six days before you arrive in Singapore.
Hepatitis A and B are prevalent in Singapore, so you might want to get a hepatitis jab before coming. The country does suffer from dengue fever epidemics from time to time, but there is no vaccine for that - you just have to take care about mosquito bites and use necessary repellants.
Getting travel insurance would be advisable, so that if you should fall sick, your insurance can pay for medical services in Singapore.
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