What Are 2 Illnesses In Humans Caused By Viruses?

What are the 2 most common viruses?

7 Remarkably Common Viral Infections ExplainedThe Common Cold.

Most adults get two to four colds a year, while children may get several more.

Influenza (The Flu) Influenza is the virus that causes the seasonal flu.

Bronchitis.

Gastroenteritis (Stomach Flu) …

Some Ear Infections.

Croup.

RSV..

What is a common virus?

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), SARS-CoV-2 and others. Viruses can affect many areas in the body, including the reproductive, respiratory, and gastrointestinal systems.

What is the most common infection in the world?

The 5 Most Common Infectious DiseasesHepatitis B. According to current statistics, hepatitis B is the most common infectious disease in the world, affecting some 2 billion people — that’s more than one-quarter of the world’s population. … Malaria. … Hepatitis C. … Dengue. … Tuberculosis.

Do viruses multiply?

How do viruses multiply? Due to their simple structure, viruses cannot move or even reproduce without the help of an unwitting host cell. But when it finds a host, a virus can multiply and spread rapidly.

What are 3 common viral infections?

Examplesmeasles.rubella.chickenpox/shingles.roseola.smallpox.fifth disease.chikungunya virus infection.

Which diseases are caused by viruses in humans?

Other common viral diseases include:Chickenpox.Flu (influenza)Herpes.Human immunodeficiency virus (HIV/AIDS)Human papillomavirus (HPV)Infectious mononucleosis.Mumps, measles and rubella.Shingles.More items…

What’s the difference between a disease and a virus?

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.

Are viruses living?

So were they ever alive? Most biologists say no. Viruses are not made out of cells, they can’t keep themselves in a stable state, they don’t grow, and they can’t make their own energy. Even though they definitely replicate and adapt to their environment, viruses are more like androids than real living organisms.

How do viruses multiply?

For viruses to multiply, they usually need support of the cells they infect. Only in their host´s nucleus can they find the machines, proteins, and building blocks with which they can copy their genetic material before infecting other cells.

Is the flu a disease or virus?

Flu is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and sometimes the lungs.

What do viruses feed on?

Viruses are the ultimate freeloaders – they sneak into our cells, eat our food and rely on our homeostasis (their favourite temperature just happens to be body temperature!)

Can a blood test detect a virus?

This test looks for antibodies to a specific viral infection. It is generally done on a blood sample. If the antibody is found, this test can show whether a person was infected recently or in the past. Viral antigen detection test.

How many viral diseases are there?

There are 219 virus species that are known to be able to infect humans. The first of these to be discovered was yellow fever virus in 1901, and three to four new species are still being found every year.

How many viruses are there in humans?

It has been estimated that there are over 380 trillion viruses inhabiting us, a community collectively known as the human virome. But these viruses are not the dangerous ones you commonly hear about, like those that cause the flu or the common cold, or more sinister infections like Ebola or dengue.

How long is a virus contagious for?

Most people will be infectious for around 2 weeks. Symptoms are usually worse during the first 2 to 3 days, and this is when you’re most likely to spread the virus.