Viruses are obligate intracellular parasites and can be classified based on different criteria: a. Classification Based on Host Host Type Description Examples Phytophage Infect plants; mostly RNA genome; rod-shaped TMV (Tobacco Mosaic Virus), CaMV Zoophage Infect animals; DNA or RNA genome; spherical Rhinoviruses, COVID-19 Bacteriophage Infect bacteria; dsDNA genome; head and tail T-phages, Lambda phages b. Classification Based on Capsid Shape Capsid Shape Virus Examples Helical TMV Polyhedral Adenoviruses Tadpole-shaped Bacteriophages Enveloped Flu viruses, HIV Spherical COVID-19 Circular Cauliflower Mosaic Virus (CaMV) c. Classification Based on Genome Type (Baltimore Classification) By David Baltimore (1971), modified in 2018–2019. 1. DNA Viruses i. Double-Stranded DNA Viruses : Use host enzymes for mRNA synthesis in nucleus. 🦠Example: Herpesvirus ii. Single-Stranded DNA Viruses : Convert into dsDNA first...
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