A variety of microorganisms can cause disease.
Pathogenic organisms are of five main types: viruses, bacteria, fungi, protozoa, and worms.
Some common pathogens in each group are listed in the column on the right.
Infectious agents can grow in various body compartments, as shown schematically in Fig.
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.
- Hepatitis C.
How do pathogens cause infectious disease?
How Pathogens Make Us Sick. Infection with a pathogen does not necessarily lead to disease. Infection occurs when viruses, bacteria, or other microbes enter your body and begin to multiply. Disease occurs when the cells in your body are damaged as a result of infection and signs and symptoms of an illness appear.
What are the 4 types of infectious diseases?
This article will focus on the most common and deadly types of infection: bacterial, viral, fungal, and prion.
What are the 7 pathogens?
Infectious diseases are caused by pathogens, which include bacteria, fungi, protozoa, worms, viruses, and even infectious proteins called prions.
What are the 6 deadliest infectious diseases?
- Deadliest Contagious Diseases By Death Toll.
- Comparison point: As of Sept.
- HIV/AIDS: 1.6 million deaths.
- Tuberculosis: 1.3 million deaths.
- Pneumonia: 1.1 million children under the age of 5.
- Infectious Diarrhea: 760,000 children under the age of 5.
- Malaria: 627,000 deaths.
What is the most contagious disease?
Measles is one of the most contagious diseases in the world. Anyone who is not protected is at risk, especially when traveling abroad. Measles vaccine works well. About 97 children out of 100 who get 2 doses of vaccine won’t get measles if they’re exposed to it.
What are the 5 types of pathogens?
A variety of microorganisms can cause disease. Pathogenic organisms are of five main types: viruses, bacteria, fungi, protozoa, and worms. Some common pathogens in each group are listed in the column on the right.
What are the 4 types of pathogens?
Pathogen types. There are different types of pathogens, but we’re going to focus on the four most common types: viruses, bacteria, fungi, and parasites.
What are the 6 types of pathogens?
Big 6 Pathogens. The FDA lists over 40 types of bacteria, viruses, parasites, and fungi that contaminate foods and cause illness, but they have singled out 6 that are the most contagious and cause the most severe symptoms. They are E coli, Hepatitis A, Nontyphoidal Salmonella, Norovirus, Shigella, Salmonella Typhi.
What are the 5 infectious agents?
There are five major types of infectious agents: bacteria, viruses, fungi, protozoa, and helminths. In addition, a new class of infectious agents, the prions, has recently been recognized. A brief review of the general characteristics of each of these agents and examples of some diseases they cause follows.
What are the 10 most common diseases?
- Unintentional injuries.
- Chronic lower respiratory disease.
- Stroke and cerebrovascular diseases.
- Alzheimer’s disease. Deaths in 2017: 121,404.
- Diabetes. Deaths in 2017: 83,564.
- Influenza and pneumonia. Deaths in 2017: 55,672.
- Kidney disease. Deaths in 2017: 50,633.
- Suicide. Deaths in 2017: 47,173.
What are the 5 modes of transmission?
There are five main routes of disease transmission: aerosol, direct contact, fomite, oral and vector, Bickett-Weddle explained at the 2010 Western Veterinary Conference. Diseases can be spread to humans (zoonotic) by those same five routes.