Adenoviruses Types 20, 25 and 28: Atypical Members of Group II

It is suggested that the adenovirus field should use Rosen’s group designation (I to IV) rather than that of the Huebner (1967) (A to D), which is based on the relationship of T-antigens within the group, since the two classifications correspond to each other (Table I) and Rosen’s proposal has the priority. As to types 20, 25 and 28, only the failure to agglutinate rat blood cells distinguishes them ffrom the other group II viruses, where as they differ form the group I viruses in the haemagglutinin properties, cytopathology, serologic relationship of virion and T-antigens and biochemical findings. In all of these properties types 20, 25 and 28 resemble group II viruses