The foamy viruses.

INTRODUCTION ........................................ 169 HISTORY ........................................ 170 CLASSIFICATION AND NOMENCLATURE .................................. 170 PROPERTIES OF VIRUSES ......... .......................... 170 Isolations and serological relationships ................................... 170 Morphology ........................................ 171 Physical and chemical structure .............. ..................... 173 Sensitivity to physical and chemical agents .................................. 173 Cultivation-host range and cytopathology .................................. 173 VIRUS REPLICATION ................................... 175 Attachment and penetration ........... ........................ 175 Multiplication ........................................ 175 Release and viral spread ........ ........................... 178 Summary ........................................ 178 RELATION TO LEUKOVIRUSES ............... .................... 178 VIRUS DISTRIBUTION IN VIVO ................ ................... 178 Natural and experimental hosts .............. ..................... 178 Mechanism of virus spread .......... ......................... 180 SERO-EPIDEMIOLOGY ................................... 181 VIRAL PERSISTENCE ................................... 182