What is difference between variolent and Avariolent?

Variolent refers to a strain of a virus, particularly in the context of viruses like smallpox, that is capable of causing disease and symptoms. Avariolent, on the other hand, describes a strain that is non-virulent or lacks the ability to cause disease. In essence, the key difference lies in their pathogenicity, with variolent strains being harmful and avariolent strains being harmless or benign.