- They aren’t always contagious. Not all viral diseases are contagious. This means they aren’t always spread from person...
- Respiratory viral diseases. Respiratory viral diseases are contagious and commonly affect the upper or lower parts of...
- Gastrointestinal viral diseases. Gastrointestinal viral diseases affect your digestive tract. The viruses that...
- Flu (influenza)
- Human immunodeficiency virus (HIV/AIDS)
A viral disease (or viral infection, or infectious disease) occurs when an organism's body is invaded by pathogenic viruses, and infectious virus particles (virions) attach to and enter susceptible cells.
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When most people hear the word \\"virus,\\" they think of disease-causing (pathogenic) viruses such as the common cold, influenza, chickenpox, human immunodeficiency virus (HIV), and others. Viruses can affect many areas in the body, including the reproductive, respiratory, and gastrointestinal systems. They can also affect the liver, brain, and skin. Research reveals that that viruses are implicated in many cancers as well.
A viral infection is a proliferation of a harmful virus inside the body. Viruses cannot reproduce without the assistance of a host. Viruses infect a host by introducing their genetic material into the cells and hijacking the cell's internal machinery to make more virus particles. With an active viral infection, a virus makes copies of itself and bursts the host cell (killing it) to set the newly-formed virus particles free. In other cases, virus particles bud off the host cell over a period of time before killing the host cell. Either way, new virus particles are then free to infect other cells. Symptoms of the viral illness occur as a result of cell damage, tissue destruction, and the associated immune response. Certain viruses -- like the ones that cause chickenpox and cold sores -- may be inactive or latent after the initial infection. For example, you may have a cold sore that erupts and then heals. The cold sore virus remains in your cells in a dormant state. At a later date, a trigger, such as stress, sunlight, or something else, may reactivate the virus and lead to new symptoms. The virus makes more copies of itself, releases new virus particles, and kills more host cells. Viruses are one of the most common causes of food poisoning. The symptoms of these infections vary depending on the virus involved. It's not pleasant to think about it, but foodborne viral illnesses are transmitted via the fecal-oral route. This means that a person gets the virus by ingesting virus particles that were shed through the feces of an infected person. Someone with this type of virus who doesn't wash their hands after using the restroom can transfer the virus to others by shaking hands, preparing food, or touching hard surfaces. Contaminated water is another potential source of infection. Sexually transmitted viral infections spread through contact with bodily fluids. Some sexually transmitted infections can also be transmitted via the blood (blood-borne transmission).
Contagiousness refers to the ability of a virus to be transmitted from one person (or host) to another. Viral infections are contagious for varying periods of time depending on the virus. An incubation period refers to the time between exposure to a virus (or other pathogen) and the emergence of symptoms. The contagious period of a virus is not necessarily the same as the incubation period.
Respiratory viral infections affect the lungs, nose, and throat. These viruses are most commonly spread by inhaling droplets containing virus particles. Examples include:
Frequent hand-washing, covering the nose and mouth when coughing or sneezing, and avoiding contact with infected individuals can all reduce the spread of respiratory infections. Disinfecting hard surfaces and not touching the eyes, nose, and mouth can help reduce transmission as well. The best way to avoid viral skin infections is to avoid skin-to-skin contact (especially areas that have a rash or sores) with an infected individual. Some viral skin infections, such as varicella-zoster virus, are also transmitted by an airborne route. Communal showers, swimming pools, and contaminated towels can also potentially harbor certain viruses. People can reduce the risk of getting a sexually-transmitted viral infection by abstaining from sex or only having sex while in a monogamous relationship with someone who does not have a sexually-transmitted infection. Using a condom decreases, but doesn't entirely eliminate, the risk of acquiring a sexually-transmitted infection. Minimizing the number of sexual partners and avoiding intravenous drug use are other ways to reduce the risk of acquiring sexually-transmitted and bloodborne viral infections. Vaccines can reduce the risk of acquiring some viral illnesses. Vaccines are available to help protect against the flu, hepatitis A, hepatitis B, chickenpox, herpes zoster (shingles), cancer-causing strains of human papillomavirus (HPV), measles/mumps/rubella (MMR), polio, rabies, rotavirus, and other viruses.
Viral skin infections can range from mild to severe and often produce a rash. Examples of viral skin infections include:
Viruses are abundant in the world and cause many other infections ranging from mild to life-threatening.
Many viral infections resolve on their own without treatment. Other times, treatment of viral infections focuses on symptom relief, not fighting the virus. For example, cold medicine helps alleviate the pain and congestion associated with the cold, but it doesn't act directly on the cold virus. There are some medications that work directly on viruses. These are called antiviral medications. They work by inhibiting the production of virus particles. Some interfere with the production of viral DNA. Others prevent viruses from entering host cells. There are other ways in which these medications work. In general, antiviral medications are most effective when they're taken early on in the course of an initial viral infection or a recurrent outbreak. Different kinds of antiviral medications may be used to treat chickenpox, shingles, herpes simplex virus-1 (HSV-1), herpes simplex virus-2 (HSV-2), HIV, hepatitis B, hepatitis C, and influenza.
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A systemic viral illness is basically a virus. Systemic means something that is all throughout the body and not localized to any one specific spot.
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It is a viral infection that comes on sort of fast, but will clear up quickly. It does not have to be severe symptoms. Chronic is when it lasts for a long time, or permenantly.
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Acute mean short term (less than 3 months) and viral just means its caused by a virus (rather than bacteria) Example of an acute viral illness is the flu.... Opposite of acute is chronic..... a chronic virus would be something like AIDS,...
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May 15, 2020 · Viruses cause familiar infectious diseases such as the common cold, flu and warts. They also cause severe illnesses such as HIV/AIDS, smallpox, and Ebola. Viruses are like hijackers. They invade living, normal cells and use those cells to multiply and produce other viruses like themselves.
- Chickenpox (Varicella): Pathogen – Herpes-zoster virus (DNA- virus) Epidemiology – Contagious & Formite borne. ADVERTISEMENTS: Incubation Period – 12-20 days.
- Smallpox (Variolla): ADVERTISEMENTS: Pathogen – Variola-virus (DNA-Virus) Epidemiology – Contagious & Droplet infection. Incubation Period – 12-days.
- Poliomyelitis: Pathogen – Polio-virus (RNA-virus) Epidemiology – Direct & oral. Incubation Period – 7-14 days. ADVERTISEMENTS: Symptoms – Damages motor neurons causing stiffness of neck, convulsion, paralysis of generally legs.
- Measles (Rubeolla-Disease): Pathogen – Rubeolla-virus (RNA-virus) ADVERTISEMENTS: Epidemiology – Contagious & Droplet infection. Incubation Period – 10 days.
Answer From James M. Steckelberg, M.D. As you might think, bacterial infections are caused by bacteria, and viral infections are caused by viruses. Perhaps the most important distinction between bacteria and viruses is that antibiotic drugs usually kill bacteria, but they aren't effective against viruses.
Coughing and sneezing. Contact with infected people, especially through kissing and sex. Contact with contaminated surfaces, food, and water. Contact with infected creatures, including pets, livestock, and insects such as fleas and ticks.
Apr 24, 2020 · Some examples of viral infections include: influenza common cold viral gastroenteritis chickenpox measles viral meningitis warts human immunodeficiency virus (HIV) viral hepatitis Zika virus West Nile virus
Oct 10, 2019 · Post-viral syndrome, or post-viral fatigue, refers to a sense of tiredness and weakness that lingers after a person has fought off a viral infection. It can arise even after common infections ...
- related to: What are viral illnesses?
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