Viral disease

A viral disease (or viral infection) occurs when an organism's body is invaded by pathogenic viruses, and infectious virus particles (virions) attach to and enter susceptible cells.[1]

Viral disease
Other namesviral infection
Transmission electron micrograph of Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) virions
SpecialtyInfectious disease

Structural Characteristics
Virions of some of the most common human viruses with their relative size. Nucleic acids are not to scale. SARS stands as for SARS as for COVID-19, variola viruses for smallpox.

Basic structural characteristics, such as genome type, virion shape and replication site, generally share the same features among virus species within the same family.

  • Double-stranded DNA families: three are non-enveloped (Adenoviridae, Papillomaviridae and Polyomaviridae) and two are enveloped (Herpesviridae and Poxviridae). All of the non-enveloped families have icosahedral capsids.
  • Partly double-stranded DNA viruses: Hepadnaviridae. These viruses are enveloped.
  • One family of single-stranded DNA viruses infects humans: Parvoviridae. These viruses are non-enveloped.
  • Positive single-stranded RNA families: three non-enveloped (Astroviridae, Caliciviridae and Picornaviridae) and four enveloped (Coronaviridae, Flaviviridae, Retroviridae and Togaviridae). All the non-enveloped families have icosahedral nucleocapsids.
  • Negative single-stranded RNA families: Arenaviridae, Bunyaviridae, Filoviridae, Orthomyxoviridae, ParamyxoviridaeParamyxoviridae and Rhabdoviridae. All are enveloped with helical nucleocapsids.
  • Double-stranded RNA genome: Reoviridae.
  • The Hepatitis D virus has not yet been assigned to a family, but is clearly distinct from the other families infecting humans.
  • Viruses known to infect humans that have not been associated with disease: the family Anelloviridae and the genus Dependovirus. Both of these taxa are non-enveloped single-stranded DNA viruses.

Pragmatic Rules

Human-infecting virus families offer rules that may assist physicians and medical microbiologists/virologists.

As a general rule, DNA viruses replicate within the cell nucleus while RNA viruses replicate within the cytoplasm. Exceptions are known to this rule: poxviruses replicate within the cytoplasm and orthomyxoviruses and hepatitis D virus (RNA viruses) replicate within the nucleus.

  • Segmented genomes: Bunyaviridae, Orthomyxoviridae, Arenaviridae, and Reoviridae (acronym BOAR). All are RNA viruses.
  • Viruses transmitted almost exclusively by arthropods: Bunyavirus, Flavivirus, and Togavirus. Some Reoviruses are transmitted from arthropod vectors. All are RNA viruses.[2]
  • One family of enveloped viruses causes gastroenteritis (Coronaviridae). All other viruses associated with gastroenteritis are non-enveloped.

Baltimore Group

This group of analysts defined multiple categories of virus. Groups:

  • I - dsDNA
  • II - ssDNA
  • III - dsRNA
  • IV - positive-sense ssRNA
  • V - negative-sense ssRNA
  • VI - ssRNA-RT
  • VII - dsDNA-RT

Clinically important virus families and species with characteristics
Family Baltimore group Important species Envelopment
Adenoviridae I[3][4] Adenovirus[3][4] N[3][4]
Herpesviridae I[3][4] Herpes simplex, type 1, Herpes simplex, type 2, Varicella-zoster virus, Epstein–Barr virus, Human cytomegalovirus, Human herpesvirus, type 8[5][6][7] Y[3][4]
Papillomaviridae I[3][8] Human papillomavirus[3][8] N[3][8]
Polyomaviridae I[3][9] BK virus, JC virus[3][9] N[3][9]
Poxviridae I[3][4] Smallpox[3][4] Y[3][4]
Parvoviridae II[3][4] Parvovirus B19[3][4] N[3][4]
Reoviridae III[10] Rotavirus,[10] Orbivirus, Coltivirus, Banna virus N[4]
Astroviridae IV[11] Human astrovirus[4] N[4]
Caliciviridae IV[10] Norwalk virus[4] N[4]
Coronaviridae IV[12] Human coronavirus 229E, Human coronavirus NL63, Human coronavirus OC43, Human coronavirus HKU1, Middle East respiratory syndrome-related coronavirus, Severe acute respiratory syndrome coronavirus,[4] Severe acute respiratory syndrome coronavirus 2 Y[4]
Flaviviridae IV[3][4][13] Hepatitis C virus,[3] yellow fever virus,[3] dengue virus,[3] West Nile virus,[3] TBE virus,[4] Zika virus Y[3][4]
Hepeviridae IV[14] Hepatitis E virus[4] N[4][14]
Matonaviridae IV[3][4][15] Rubella virus[3][16] Y[3][4]
Picornaviridae IV[17] coxsackievirus, hepatitis A virus, poliovirus,[4] rhinovirus N[4]
Arenaviridae V[18] Lassa virus[4][18] Y[4][18]
Bunyaviridae V[19] Crimean-Congo hemorrhagic fever virus, Hantaan virus[4] Y[4][19]
Filoviridae V[20] Ebola virus,[20] Marburg virus[20] Y[4]
Orthomyxoviridae V[3][21] Influenza virus[3][21] Y[3][21]
Paramyxoviridae V[22] Measles virus,[3] Mumps virus,[3] Parainfluenza virus[3][4] Y[3][22]
Pneumoviridae V [23] Respiratory syncytial virus[3] Y[3]
Rhabdoviridae V[24] Rabies virus[3][4] Y[3][4]
Unassigned[25] V[25] Hepatitis D[25] Y[25]
Retroviridae VI[3][26] HIV[3][4] Y[3][4]
Hepadnaviridae VII[3] Hepatitis B virus[3][4] Y[3][4]

Clinical characteristics

The clinical characteristics of viruses may differ substantially among species within the same family:

Type Family Transmission Diseases Treatment Prevention
Adenovirus Adenoviridae
  • droplet contact[3]
  • fecal-oral[3]
  • venereal[3]
  • direct eye contact[3]
 None[3]
  • Adenovirus vaccine
  • hand washing
  • covering mouth when coughing or sneezing
  • avoiding close contact with the sick
Coxsackievirus Picornaviridae None[3]
  • hand washing
  • covering mouth when coughing/sneezing
  • avoiding contaminated food/water
  • improved sanitation
Cytomegalovirus Herpesviridae
  • hand washing
  • avoid sharing food and drinks with others
  • safe sex
Epstein–Barr virus Herpesviridae None[3]
  • avoiding close contact with the sick
Hepatitis A virus Picornaviridae Immunoglobulin (post-exposure prophylaxis)[3]
Hepatitis B virus Hepadnaviridae

Vertical and sexual[32]
Hepatitis C virus Flaviviridae
  • avoiding shared needles/syringes
  • safe sex
Herpes simplex virus, type 1 Herpesviridae
  • avoiding close contact with lesions
  • safe sex
Herpes simplex virus, type 2 Herpesviridae
  • avoiding close contact with lesions[3]
  • safe sex[3]
HIV Retroviridae HAART,[3] such as protease inhibitors[34] and reverse-transcriptase inhibitors[34]
  • zidovudine (perinatally)[3]
  • blood product screening[3]
  • safe sex[3]
  • avoiding shared needles/syringes
Human coronavirus 229E (HCoV-229E) Coronaviridae
Human coronavirus NL63 (HCoV-NL63) Coronaviridae
  • droplet contact
Human coronavirus OC43 (HCoV-OC43) Coronaviridae
Human coronavirus HKU1 (HCoV-HKU1) Coronaviridae
Human herpesvirus, type 8 Herpesviridae many in evaluation-stage[3]
  • avoid close contact with lesions
  • safe sex
Human papillomavirus Papillomaviridae
Influenza virus Orthomyxoviridae
  • droplet contact[3]
Measles virus Paramyxoviridae None[3]
Middle East respiratory syndrome-related coronavirus (MERS-CoV) Coronaviridae
  • close human contact
Mumps virus Paramyxoviridae None[3]
Parainfluenza virus Paramyxoviridae None[3]
  • hand washing
  • covering mouth when coughing/sneezing
Poliovirus Picornaviridae None[3]
Rabies virus Rhabdoviridae Post-exposure prophylaxis[3]
Respiratory syncytial virus Pneumoviridae (ribavirin)[3]
  • hand washing[3]
  • avoiding close contact with the sick[3]
  • palivizumab in high risk individuals[3]
  • covering mouth when coughing/sneezing
Rubella virus Togaviridae None[3]
Severe acute respiratory syndrome coronavirus (SARS-CoV) Coronaviridae
  • droplet contact
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Coronaviridae
  • droplet contact
Varicella-zoster virus Herpesviridae
  • droplet contact[3]
  • direct contact

Varicella:

Zoster:

Varicella:

Zoster:

  • vaccine
  • varicella-zoster immunoglobulin

See also

References
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