Biology, asked by rooheefp, 1 year ago

what are viruses ? Name some common diseases in humans caused by virus .

Answers

Answered by Anonymous
17
Viruses are on the borderline of living and non - living organisms. It is a type of microorganisms.
Diseases caused by viruses in humans are -
Common cold, influenza, mumps, polio, chickenpox,AIDS.

Hope it helps you

Anonymous: i think second answer is best
Answered by Anonymous
7
hi.


Viruses are present in almost every ecosystem on earth. They are marked as the most abundant biological entity on this planet. But sometimes these largely present entities cause trouble in human body. Viral Infection is one of the most common ailments affecting people. In simple parlance, a disease that is/can be caused by different types of virus is known as Viral Infection. It can affect various parts of the human body. It is observed that some viruses are in the intestine, while many are in lungs and airways. When infected, a patient may complain about abdominal pain, diarrhea, coughing and breathlessness.

Viruses can be spread or transmitted through various ways. Some people may get a viral infection by swallowing or inhaling virus, by being bitten by insects, through sexual contact or through transfusion of contaminated blood.

How does Viral Infection affect human body?

Viruses can be termed hijackers, as they invade healthy, living and normal cells to produce and multiply other viruses like them. These small infectious organisms need a living cell for reproduction. Hence they enter the host cell and release their DNA or RNA inside the host cell. This DNA or RNA contains the information which is required to replicate the virus. The interesting thing about viruses is that they are extremely unique microorganisms since they cannot reproduce without a host cell. So, after entering the host cell, the genetic material of the virus takes charge of the host cell and compels it to replicate the virus. In this operation, usually, the infected cell dies as the virus stops it from performing its usual functions. The entire process makes the human body feel weak and sick. Basically, a viral infection is a common term for many kinds of diseases caused by a virus. What do these diseases have in common, except for the virus? It is the symptoms like high fever, fatigue and body pain that makes the patient feel miserable.

There are many kinds of viruses- gastro intestinal viruses and airways viruses, being the most common ones. These viruses mostly cause fatigue and fever. Other viruses cause other local symptoms such as laryngitis, shingles and cold sores.

What are the different types of Viral Infections?

The most common type of virus led infection is the Respiratory Infection.

Respiratory infection affects the throat, upper airways and lungs. Most common respiratory infection includes a sore throat, common cold, sinus, pneumonia and influenza. Respiratory infection causes a lot of troubles in infants, older people and people suffering from lung or heart disorder.

Apart from respiratory infection, these can affect other specific parts/organs of the human body:

Liver: The presence of virus in liver can result in HepatitisGastrointestinal tract: The existence of virus in the gastrointestinal tract, like gastroenteritis, is usually caused by rotavirus and norovirus.Nervous System: Certain viruses like rabies virus and west nile virus infect human brain and cause encephalitis. There are some other viruses as well that infect the tissue layer covering the brain and spinal cord. These can cause meningitis.Skin: There are some kind of viruses that cause skin infection which result in blemishes or warts. Many viruses that affect other body organs/parts, like chickenpox can cause rashes on the skin.

What diseases are caused by viruses?

Many human diseases are caused by virus led infections. These include:

SmallpoxColdChickenpoxMeaslesHepatitisHuman Papiloma VirusInfluenzaShinglesHerpesPolioRabiesHIV (Human Immunodeficiency Virus)Cold SoresEbolaSARS (Severe Acute Respiratory Syndrome)Epstein-Barr VirusDengueSome types of Cancer

What are the common symptoms of Viral Infection?

High FeverTiredness or FatigueHeadacheDiarrheaSore throatAbdominal PainCoughingRunny noseSkin rashNausea and vomitingMuscle acheChillsStiffness in neckSeizuresLoss of sensationImpaired bladderImpaired bowel functionParalysis of limbsSleepinessConfusion

It is important to note here that not all the people who show these signs or symptoms need medical treatment. If the symptoms are mild, it is advised to wait for a few days as most of them disappear on their own. This is basically due to the activation of body’s own defense mechanism that destroys the virus and make the symptoms to fade away.

When is a Viral Infection serious?

Almost every person has had a flu or a bad cold at least once in their lifetime. So usually, a viral infection is not that serious. However, at times, such infections can become extremely troublesome. Below mentioned are some of the scenarios when a virus led infection can be considered serious:

Complaints and symptoms lasting for more than seven daysHigh fever lasting for more than five daysBreathlessnessNew reddish rash or spots on the body
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