There are two classification of virus;
1. RNA virus
2. DNA virus
RNA Virus
1. Picornaviridae family
Small RNA virus, cause commond cold and poliomyelitis.
For example;
Polio virus
Echo virus
Rhinovirus
2. Orthomyxoviridae family
Includes influenza virus causing influenza (bird flue) and seasonal flue.
For example; influenza virus type A, B, C etc.
3. Paramyxoviridae family
Causing respiratory infections; measles, mumps in infants and children.
4. Togaviridae family
Mainly cause rubella and chickungunya infection (transmitted by mosquitoes bite from human to human).
5. Flaviviridae family
Cause (insect) arthropod borne Infections.
Mosquito and ticks transmitted. These Infections cause hemorrhagic reaction including dengue and yellow fever called arbovirus.
6. Bunyaviridae family
Largest group of insect borne disease.
7. Rhabdoviridae family
Bullet shaped virus causes rabies.
8. Reoviridae family
Contains rotavirus and is responsible for number of cases of diarrhoea and childhood diarrhoea cases.
9. Coronaviridae family
Have club shaped projection on surface, also cause viral disease called SARS.
10. Retroviridae family
Contain RNA viruses and converts RNA to DNA for replication.
For example; HIV virus
DNA Virus
1. Poxviridae family
Largest virus responsible for skin infections and molluscum contagiosum.
For example;
Small pox
Cow pox
Vaccinia
2. Herpes viridae family
Cause herpes and chicken pox infection in nerve ganglia.
For example;
Herpes simple virus
CMV (cytomegalovirus)
EBV (Epstein Barr virus)
3. Hepadna viridae family
Include hepatitis B virus
It is only hepatitis B virus which contain DNA.
It is blood borne pathogen.
4. Parvoviridae family
Vary small viruses causing slapped cheek disease.
5. Papovaviridae family
Small viruses causing skin and genital warts.
Oncogenic.
6. Adenoviridae family
Effect children and cause respiratory tract infection, diarrhoea and conjuctivitis.
For example;
Herpes simplex virus, varicella zoster virus
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