The Most Prevalent Human Infectious Diseases Are Caused By?

Infectious diseases can be caused by:

  • Bacteria. These one-cell organisms are responsible for illnesses such as strep throat, urinary tract infections and tuberculosis.
  • Viruses. Even smaller than bacteria, viruses cause a multitude of diseases ranging from the common cold to AIDS.
  • Fungi.
  • Parasites.

Where are infectious diseases most common?

The 5 Most Common Infectious Diseases

  1. Hepatitis 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.
  2. Malaria.
  3. Hepatitis C.
  4. Dengue.
  5. Tuberculosis.

What causes infectious diseases in the human population?

Infectious diseases are caused by pathogenic microorganisms, such as bacteria, viruses, parasites or fungi; the diseases can be spread, directly or indirectly, from one person to another. Zoonotic diseases are infectious diseases of animals that can cause disease when transmitted to humans.

What is the most contagious disease in the world?

The 5 most deadly contagious diseases

  • HIV/AIDS: 1.6 million deaths in 2012.
  • Tuberculosis: 1.3 million deaths in 2012.
  • Pneumonia: 1.1 million children under the age of five, according to yearly estimates.
  • Infectious diarrhea: 760,000 children under the age of five, according to yearly estimates.
  • Malaria: 627,000 deaths.

What are the 5 diseases caused by bacteria?

Bacterial disease

  1. Bacteria.
  2. Infectious disease.
  3. Cholera.
  4. Leprosy.
  5. Tuberculosis.
  6. Plague.
  7. Syphilis.
  8. Anthrax.

What are the 5 most common infectious diseases?

The 5 Most Common Infectious Diseases

  • Hepatitis 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.

What is the deadliest disease?

The deadliest disease in the world is coronary artery disease (CAD). Also called ischemic heart disease, CAD occurs when the blood vessels that supply blood to the heart become narrowed.

How do diseases affect the human population?

Fertility, migration and urbanization affect the spread of diseases including tuberculosis, malaria and HIV/AIDS. Increased population densities and unhealthy living conditions in urban slums can ease the transmission of infections. Migration may also increase vulnerability to disease.

Why diseases are increasing?

Chronic diseases and conditions are on the rise worldwide. An ageing population and changes in societal behaviour are contributing to a steady increase in these common and costly long-term health problems. This is pushing obesity rates and cases of diseases such as diabetes upward.

What can overcrowding lead to?

For communities, inadequate shelter and overcrowding are major factors in the transmission of diseases with epidemic potential such as acute respiratory infections, meningitis, typhus, cholera, scabies, etc. Outbreaks of disease are more frequent and more severe when the population density is high.

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