SUBJECT INDEX 



427 



"Viropexis", 17, 18, phagocytosis and, 51 

 Virulence 



definition of, 226-227 



genetic marker and, 280 



mouse lung, redistribution and, 291-292 



recombination, influenza virus and, 159 



redistribution 



discontinuous mutation and, 292-293 



mouse lung and, 291-292, 296 



neuropathogenicity and, 290-291 

 virus interference and, 158-159 

 Virulence variation 

 host-induced 



encephalomyocarditis virus and, 229 



influenza A virus and, 229 



Newcastle disease virus and, 229 

 mechanisms 



bacterial viruses and, 228 



genetic recombination and, 229-230 



host-induced and, 229 



mutation and, 229 

 virus-host-cell systems 



coexistence and, 234 



hamster lung and, 237-240 



influenza virus O-D change and, 230- 

 232 



mouse lung and, 237-240 



mousepox and, 241-242 



myxomatosis and, 244-246 



pock variants and, 236-237 



poliomyelitis and, 242-244 



poliovirus tissue culture and, 232-233 



yellow fever and, 242 

 Viruses, see also individual viruses 

 Viruses, bacterial, see Bacteriophage 

 classification, 3-7 

 comparison of, 7-9 

 definition of, 1-3, 112 

 evolution of, 10-11,229 

 functional unity of, 11-14 

 heterologous, interference between, 161- 



166 

 homologous, interference between, 166- 



170 

 inactivated, interference between, 170, 



171 

 infection, initiation and, 15-1 8 

 marker characteristics 



incidental and, 280 



morphologic and, 279 



reproductive and, 280 



somatic and, 279 

 technical requirements 



marker characteristics and, 279-280 



pure clone isolations and, 277-279 



recombination experiments and, 280- 

 282 

 Virus growth 



eclipse phase, 112-113 



bacteriophages and, 113-114 



large viruses and, 116-120 



medium-sized viruses and, 115-116 



small viruses and, 114-115 

 herpes simplex virus and, 137 

 incomplete virus 



partial cycle and, 149 



production of, 146 



properties of, 144 

 infected cells 



antigens and, 126 

 influenza virus and, 135-136 

 lag period 



antigenic properties and, 120-122 



recoverable virus and, 113-120, 122- 

 126 

 Newcastle disease virus and, 136-137 

 poliovirus and, 133-134 

 vaccinia virus and, 137-138 

 western equine encephalitis virus and, 



112, 134-135 

 Virus infection 



host cell surface and, 13 

 prevention 



extracellular environment and, 198- 

 199 



extracellular virus and, 199-201 



host cell alteration and, 201 

 Virus interference, see also Autointer- 



ference 

 definition, 160 



mutual exclusion and, 159, 174 



virulence and, 158-159 

 dynamics of, 182-185 

 experimental systems 



dosage and, 170, 172 



growing cell cultures and, 181-182 



heterologous viruses and, 161-166 



homologous viruses and, 166-170 



inactivated viruses and, 170, 171 



localized character and, 172-173 



