Virology Introduction

Slide 1: 

بسم الله الرحمن الرحيم

Bassam.A.Al-yassi : 

Bassam.A.Al-yassi Medical science Lab medicine KSA- hospital of king Abdul Aziz

Virology Introduction : 

Virology Introduction Definitions. Intoduction. Structure of virus. Virus transmission. Classification of virus. DNA Virus. RNA Virus. Treatment.

Definitions : 

Definitions Virology: The science which study the virus and viral diseases. Virus: A genitic material containing either DNA or RNA genome that is able to alternate between intra and extra cellular states. Virus: Is a microscopic infectious agent that can reproduce only inside a host cell.

General virology : 

General virology

Introduction : 

Introduction The virus is usually very, very small compared to the size of a living cell (20 – 300 nm). Viral components are assembled and don’t replicate By “ division “. Viruses need to host cell to produce their components For replication. Viruses have a naked capsid or an envelope morphology.

Structure of virus : 

Structure of virus

Structure of virus : : 

Structure of virus : 1- Nucleic acid(genome) : DNA or RNA not both. 2- Capsid(protein coat) : Which protect the genitic material. a)Helical. b) Icosahedral. 3- Envelope : That surrounds them then they are outside the cell.

Helical Icosahedral : 

Helical Icosahedral

viruses transmission : 

viruses transmission Viruses spread by coughing and sneezing (Influenza viruses). Viruses are transmitted by the faecal-oral route such as (Norovirus), via contact with contaminated hands, food, or water. HIV is one of several viruses that are transmitted through sexual contact.

Viruses classification : 

Viruses classification DNA viruses remember HHAPPPy. Herpes. Hepadna. Adeno. Pox. Parvo. Papova=Polyoma+papilloma. *all DNA viruses replicate in the nucleus except POX replicate in the cytoplasm. *all DNA viruses are dsDNA except PARVO ssDNA. *all DNA viruses are icosahedral except POX is complex. *3 DNA viruses are naked PAP(Parvo, Adeno and Papova).

Continue : 

Continue RNA viruses: *all RNA viruses are ssRNA except REO is ds RNA. *all RNA viruses replicate in the cytoplasm except ORB (Orthomyxo, Retro and Borna) replicate in the nucleus. *3 RNA viruses are non enveloped PCR (Picorna, Calici And Reo). *5 RNA viruses have icosahedral PCR+FT ( Flavi and Toga).

Parvovirus B19Vcause Rash : 

Parvovirus B19Vcause Rash

Adeno Viruscause Conjuctivitispink eye : 

Adeno Viruscause Conjuctivitispink eye

pox VirusSmallpox : 

pox VirusSmallpox

Rhabdo Virus : 

Rhabdo Virus

Treatment : 

Treatment Drugs that use for viral infections are called antiviral drugs. Interferons: which stop or slow virus replication. Vaccines: for antibody formation,before expoure to disease. Immunoglobulins: are related to immun system and help to kill the virsu.

THANK YOU : 

THANK YOU