“…Later on the basis of cross-protection tests [10], the similarity of symptoms and filamentous morphology between ringspot and psorosis isolates [19,42], and differences in number of particles of CPsV detected by immunosorbent electron microscopy (ISEM) using an antiserum to the isolate CPV-4 [43], it was suggested that ringspot and psorosis are variants of the same disease. The same conclusions were advanced by Da-Graça et al [7] and Rouag et al [56] respectively, who used serological and molecular comparisons.…”