Cloud computing, an emerging Internet-based development provides various platform and software services has become a significant issue. Many bioinformatics tools developed based on the Internet for biologists without reconstructing the whole software in the local system. Therefore, bioinformatics as a service is a new significant demand of cloud computing that integrates the bioinformatics tools to cloud platform to provide more efficient bio-computing services. In this paper, we propose a virus analysis service on the cloud. Norovirus is used as case study for this service. The result demonstrates that the proposed cloud service is able to be easily used to analyze virus data by using remote computing resources.