Introduction: The Science of Virology. Titration of Viruses. Properties of Virions. The Biochemistry of Viruses. General Features of Virus-Host Interaction. Phage-Bacterium Interaction: General Features. Productive Phage Cycle: T-Even Colliphages. Productive Phage Cycle: Selected Phage Groups. Bacteriophage. Other Temperature Phages. Introduction to Animal Cell Biology. Animal Viruses: Adsorption & Entry into The Cell. Animal Virus Multiplication: The RNA Viruses. Animal Viruses Multiplication: DNA Viruses and Retroviruses. Effect of Animal Viruses on Host Cells & Organisms. Tumor Viruses. Interaction of Plant Viruses with Their Hosts. Insect-Pathogenic Viruses. Origin and Nature of Viruses.