The CDC (Center for Disease Control and Prevention) has lifted its advisory against unnecessary travel to Singapore as the SARS outbreak appears to be coming under control in the city-state. Indonesia is not a country with high risk of transmission, therefore there is no longer any reason not to go to Manado. It is not more dangerous than to stay at home.

The complete new in this webpage.

Anyway Singapore Airlines, the air carrier used for the trip, put in act exceptional safety measures to avoid the risk of transmission, including HEPA (Highly Efficient Particulate Arrestor) filters in the air filtration system, the same filters used in hospital intensive care wards.
If you are looking for further details, visit the exhaustive Singapore Airlines website.

As a matter of fact, travelling to Manado is not risky. On the other hend, the fabulous offers remain, valid until July... are you still waiting?