Viral disease

The theme of Viral disease is a theme that has been present throughout human history. Since ancient times, Viral disease has been a source of study, discussion and reflection. Its importance transcends cultural, generational and geographical barriers, covering aspects as diverse as philosophy, science, politics, art and daily life. Over the centuries, Viral disease has been subject to multiple interpretations and has acquired different meanings depending on the context in which it is framed. In this article, we will delve into the fascinating universe of Viral disease, exploring its various facets and its relevance today.

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

Examples are the common cold, gastroenteritis and pneumonia.

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.[citation needed]

Pragmatic rules

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

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.[citation needed]

Baltimore group

This group of analysts defined multiple categories of virus. Groups:[citation needed]

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

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
  • fecal-oral
  • venereal
  • direct eye contact
None
  • Adenovirus vaccine
  • hand washing
  • covering mouth when coughing or sneezing
  • avoiding close contact with the sick
Coxsackievirus Picornaviridae
  • fecal-oral
  • respiratory droplet contact
None
  • 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
  • saliva
None
  • avoiding close contact with the sick
Hepatitis A virus Picornaviridae
  • fecal-oral
Immunoglobulin (post-exposure prophylaxis)
Hepatitis B virus Hepadnaviridae

Vertical and sexual

  • Hepatitis B vaccine
  • immunoglobulin (perinatal and post-exposure prophylaxis)
  • avoiding shared needles/syringes
  • safe sex
Hepatitis C virus Flaviviridae
  • blood
  • sexual contact
  • avoiding shared needles/syringes
  • safe sex
Herpes simplex virus, type 1 Herpesviridae
  • direct contact
  • saliva
  • avoiding close contact with lesions
  • safe sex
Herpes simplex virus, type 2 Herpesviridae
  • sexual contact
  • vertical transmission
  • avoiding close contact with lesions
  • safe sex
HIV Retroviridae HAART, such as protease inhibitors and reverse-transcriptase inhibitors
  • zidovudine (perinatally)
  • blood product screening
  • safe sex
  • 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
  • Saliva
  • Sexual
many in evaluation-stage
  • avoid close contact with lesions
  • safe sex
Human papillomavirus Papillomaviridae
  • HPV vaccine
  • avoiding close contact with lesions
  • safe sex
Influenza virus Orthomyxoviridae
  • droplet contact
Measles virus Paramyxoviridae
  • droplet contact
None
  • MMR vaccine
  • quarantining the sick
  • avoiding contact with the sick
Middle East respiratory syndrome-related coronavirus (MERS-CoV) Coronaviridae
  • close human contact
Mumps virus Paramyxoviridae
  • droplet contact
None
Parainfluenza virus Paramyxoviridae
  • droplet contact
None
  • hand washing
  • covering mouth when coughing/sneezing
Poliovirus Picornaviridae
  • fecal-oral
None
  • Polio vaccine
  • avoiding contaminated food and water
  • improved sanitation
Rabies virus Rhabdoviridae
  • animal bite
  • droplet contact
Post-exposure prophylaxis
Respiratory syncytial virus Pneumoviridae
  • droplet contact
  • hand to mouth
(ribavirin)
  • hand washing
  • avoiding close contact with the sick
  • palivizumab in high risk individuals
  • covering mouth when coughing/sneezing
Rubella virus Togaviridae
  • Respiratory droplet contact
None
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
  • direct contact

Varicella:

Zoster:

Varicella:

Zoster:

  • vaccine
  • varicella-zoster immunoglobulin

See also

References

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External links