| Viral disease | |
|---|---|
| Other names | Viral infection |
| Types of viral diseases | |
| Specialty | Infectious disease |
| Causes | Virus |
| Medication | Antiviral drugs |
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. Virosis is a disease or infection caused by a virus.
Examples include the common cold, gastroenteritis, COVID-19, the flu, and rabies.

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]
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]
This group of analysts defined multiple categories of virus. Groups:[citation needed]
The clinical characteristics of viruses may differ substantially among species within the same family:
| Type | Family | Transmission | Diseases | Treatment | Prevention |
|---|---|---|---|---|---|
| Adenovirus | Adenoviridae |
|
None |
| |
| Coxsackievirus | Picornaviridae |
|
None |
| |
| Cytomegalovirus | Herpesviridae |
|
| ||
| Epstein–Barr virus | Herpesviridae |
|
None |
| |
| Hepatitis A virus | Picornaviridae |
|
Immunoglobulin (post-exposure prophylaxis) |
| |
| Hepatitis B virus | Hepadnaviridae |
|
| ||
| Hepatitis C virus | Hepaciviridae |
|
|
| |
| Herpes simplex virus, type 1 | Herpesviridae |
|
|
| |
| Herpes simplex virus, type 2 | Herpesviridae |
|
|
| |
| HIV | Retroviridae |
|
HAART, such as protease inhibitors and reverse-transcriptase inhibitors |
| |
| Human coronavirus 229E (HCoV-229E) | Coronaviridae |
|
|||
| Human coronavirus NL63 (HCoV-NL63) | Coronaviridae |
|
|||
| Human coronavirus OC43 (HCoV-OC43) | Coronaviridae | ||||
| Human coronavirus HKU1 (HCoV-HKU1) | Coronaviridae | ||||
| Human herpesvirus, type 8 | Herpesviridae |
|
|
many in evaluation-stage |
|
| Human papillomavirus | Papillomaviridae |
|
|
| |
| Influenza virus | Orthomyxoviridae |
|
| ||
| Measles virus | Paramyxoviridae |
|
None |
| |
| Middle East respiratory syndrome-related coronavirus (MERS-CoV) | Coronaviridae |
|
|||
| Mumps virus | Paramyxoviridae |
|
None |
| |
| Parainfluenza virus | Paramyxoviridae |
|
None |
| |
| Poliovirus | Picornaviridae |
|
None |
| |
| Rabies virus | Rhabdoviridae |
|
|
Post-exposure prophylaxis |
|
| Respiratory syncytial virus | Pneumoviridae |
|
(ribavirin) |
| |
| Rubella virus | Togaviridae |
|
None |
| |
| Severe acute respiratory syndrome coronavirus (SARS-CoV) | Coronaviridae |
|
|||
| Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) | Coronaviridae |
|
| ||
| Varicella-zoster virus | Herpesviridae |
|
Varicella:
Zoster:
|
Varicella:
Zoster:
|