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Pathogen

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VIRUSES

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ACELLULAR MICROORGANISM (VIRUSES)

Viral structure

Other

Body

Tail

Spike

envelope

Covered the capsid

Made up of:

Carbohydrate

Protein

Lipid

Capsid

Protein coat surrounding nucleic acid

Nucleic acid

RNA

segmented ds

segmented

ss

DNA

Circular

Linear

ds, ss

Structure of virus

Virus Family

RNA viruses

Release through rupture of host cell

Orthomyxoviridae

Influenza C virus

Deltaviridae

Hepatitis D virus

Paramyxoviridae

Morbillivirus

Paramyxovirus

Filoviridae

Filovirus

Rhabdoviridae

Lyssavirus

Vesiculovirus

Coronaviridae

Coronavirus

Flaviviridae

Hepatitis C virus

Togaviridae

Rubivirus

Alphavirus

Multiplication occurs in cytoplasm

DNA viruses

DNA are release into the nucleus of infected host cell

Caliciviridae

Norovirus

Hepatitis E virus

Picornaviridae

Hepatitis A virus

Rhinovirus

Enterovirus

Hepadnaviridae

Hepadnavirus

Herpesviridae

Cytomegalovirus

Poxviridae

Molluscipoxvirus

Orthopoxvirus

Papovaviridae

Polyomavirus

Papillomavirus

Adenoviridae

Mastadenovirus

Parvoviridae

Human parvovirus

Taxonomy

Characteristics to divide viruses into taxonomic group

6. Number of capsomers in icosahedral viruses

5. Diameter of the virion or nucleocapsid

4. Presence of envelope

3. Capsid symmetry

2. Nucleic acid characteristics

1. Nature of host

Names of virus

Genus and sp. = virus

Subfamily = ends with virinae

Family = ends with viridae

Morphology

Complex viruses

Enveloped viruses

Enveloped polyhedral viruses

Simplexvirus

Enveloped helical virus

Influenzavirus

Polyhedral viruses

Poliovirus

Adenovirus

Helical viruses

Ebola virus

Size

Size comparision

Bacteriophages

Replication/Multiplication

Lysogenic cycle

Host remain alive

Lytic cycle

Host die

Host

Specific

Narrow range

Can infect

Fungi

Bacteria

Protist

Plant

Vertebrae

invertebrae

General characteristics

Multiply inside living cell

Contain protein coat

Single type nucleic acid

never both

DNA or RNA

Obligate intracellular parasite

Smaller than bacteria

Latin word "poison"

Classification

According to International Committee for Taxonomy or Virus

e. Type of host

d. Presence/absence of envelope

c. The sense (+ve/-ve) of ssRNA

b. Nucleic acid strandedness

a. Nucleic acid type