Virology Flashcards
Small, acellular, obligate intracellular parasite, non-living, non-replicating infectious agent
Virus
Complete, fully developed, infectious viral particle composed of nucleic acid genome packaged into a protein coat (capsid), which may be surrounded by a membrane (envelope)
Virion ⭐
Made up of only one type of nucleic acid, either DNA or RNA
Nucleic Acid Core
Protein coat or shell that encloses nucleic acid genome
Capsid
Capsid is made up of small units called
Capsomere
Lipid layer surrounding the viral coat and may contain spikes
Envelope
Naked virus
can be spread easily, more virulent ; stable
Enveloped Virus
Spreads in large droplets, secretions, organ or blood transplants; unstable in GIT
Viral symmetry
Helical
Icosahedral/Polyhedral
Cubic/Icosahedral – spherical
All DNA viruses except
POXVIRIDAE
DNA Viruses
Papilloma
Parvo
Papova
Polyoma
Pox
Adeno
Herpes
Hepadna
DNA Viruses replicate in
Nucleus
All DNA Virus are double stranded, except
Parvoviridae
Naked DNA Virus
Parvo
Adeno
Polyoma
Papilloma
Enveloped DNA Virus
Herpes
Hepadna
Pox
RNA Viruses
Arena
Arteri
Astro
Borna
Bunya
Calici
Corona
FIlo
Flavi
Orthomyxo
Paramyxo
Picorna
Reo
Retro
Rhabdo
Toga
Toro
All RNA Viruses are Single-stranded, except
Reoviridae
All RNA Viruses are enveloped, except
Picorna
Reo
Calici
Hepe
Astro
All RNA Viruses are Helical, except
Flavi
Astro
Toga
Calici
Picorna
Reo
Retro
FAT CPRR
All RNA Viruses replicate in the cytoplasma, except
Retroviridae
Orthomyxoviridae
Lysogenic Stage
No signs and symptoms (avirulent stage); synthesis and packaging of virions (mature viral particles)
Lytic Stage
Presence of signs and symptoms; release of virions
Steps in Viral Infection
- Attachment of virus to host cell
- Penetration of virus into host cell
- Expression of viral genome
- Replication of virus
- Synthesis of virions
- Packaging and release of virions
Obligates, intracellular, single stranded, naked rna; smallest pathogen that can infect plants
Viriods
