Morphopathological aspects of viral immunity

After a succinct presentation of the development of an immune response and of the "resting" morphological structure of organs and cells involved in immunologic phenomena, data are reviewed as concerns the morphological changes occurring in the immune system following contact with virus antigens and the alterations in the organs predominantly affected by different viral agents. Special attention is paid to the role of morphological studies in the elucidation of immunologic mechanisms and to the break-through represented by the early works of C. Levaditi and St. S. Nicolau, the creators of the Romanian school of virology.