. Electron microscopy; proceedings of the Stockholm Conference, September, 1956 . Fig. 1. Strain Type A-1953. Magnification 18,000. hig. 2. Strain TM 1. Type A'-1954. Magnification 1 1,000. In the "filamentous" strains the hemagglutination titer of the infected allantois fluid was very low and amounted from 1:40 up to 1:160. Although the morphological pattern of the "LAK" strain after the 1st and 15th passages was different, no diflerence was established in the antigenic structure. The "filamentous" strains of the virus show strong polymorphism. In addition t
. Electron microscopy; proceedings of the Stockholm Conference, September, 1956 . Fig. 1. Strain Type A-1953. Magnification 18,000. hig. 2. Strain TM 1. Type A'-1954. Magnification 1 1,000. In the "filamentous" strains the hemagglutination titer of the infected allantois fluid was very low and amounted from 1:40 up to 1:160. Although the morphological pattern of the "LAK" strain after the 1st and 15th passages was different, no diflerence was established in the antigenic structure. The "filamentous" strains of the virus show strong polymorphism. In addition to the round bodies, there are also "transitory" forms (from spheres to filaments) and complicated filamentous forms which were called by Draganow These poly- morphic bodies are characteristic only for the re- cently-isolated strains and were observed on the A-prime-type. All the B-type strains turned out to be those of round forms. In my view the filamentous forms present an ear- lier stage of the development of the virus which then pass into elementary round bodies. The present work was carried out under the guidance of Professor Przesmycki to whom I express my thanks. I should like to acknowledge the assistance of Mrs. K. Zgorzelska and Dr. B. Malczewski in the preparation of the virological samples. References 1. Angulo, J. J., Arcli. Virusforscli. 4, 199 (1951). 2. Archetti, L., Arch. Vinisforsch. 6, 29 (1955). 3. Chu, C. M., Dawson, I., and Elford, W. J., Lancet 256, 602 (1949). 4. Donald, H. B., Isaacs, A., J. Gen. Microbiol. 11, 325 (1954). 5. Draganow, K. I., J. Gen. Biol. {) 17, 13 (1956). 6. Feltynowski, a. and Zych, Z., Med. Doswiadc:alna i Mil<robiol. 5, 423 (1953). 7. HoYLE, L., /. Hyg. Camh. 48, 277 (1950). 8. MosLEY, V. M. and Wvckofe, R. W. G., Nature 157, 263 (1946). 9. Przesmycki, F. et al., Med. i Mi/<robiol. 6, 241 (1954). 10. Przesmycki, F. er Bull. Acad. Polon. Sci. C\. II, 4, 111 (1956). 11. Wyckoef,
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