Methods, compositions, systems, and devices are provided for performing and analyzing agglutination assays. In one aspect, methods for image analysis of agglutination assays are provided. In another aspects, methods for performing agglutination assays are provided. In one aspect, the methods may be used for the detection of various molecules, including viruses or antibodies against a virus. In another aspect, the methods can be used to determine effective immunization of a subject.