Infectious Diseases

Infectious Diseases

Infectious diseases are the diseases of microbial pathogens, namely viruses, bacteria, fungi, and parasites. These may be transmittable or non-communicable. They may be spread by plants, humans, or insects. The agents who spread the pathogens or pass them on are called vectors or intermediaries of the disease.

Types of Infection

A disease is a condition that, through hampering body processes, impacts only a portion of the whole body. Infectious or non-infectious diseases, both, can cause illness. In general, non-infectious causes may be internal factors, genetic irregularities, and lifestyle, while infectious diseases are caused by pathogenic microorganisms, which are the agents causing the infection. Certain disorders caused by organisms that live in and on are known as infectious diseases. Organisms like viruses fungi bacteria parasites etc can cause a number of infectious diseases. Infectious diseases can be passed from one person to another; some diseases were also transmitted by other animals or insects.

Causes of infectious diseases

are caused by pathogens invading the body. For, e.g., a particular virus can trigger a viral infection. There are infectious agents all around us, and they come in varying forms and sizes. They may be classified on the basis of certain common features. Some of these are single-celled animals like fungi, bacteria, and viruses. Other multicellular organisms like worms are also known to cause illnesses. Microscopic organisms that are most likely to cause infections are also known as pathogens.
Pathogens
Pathogens are basically disease-causing agents. These include viroid's, nematodes, prions, arthropods, notably mites and fleas and macro-parasites such as helminths and roundworms. Such diseases arise when an organism invades the cells and tissues of the human body with an infection-causing agent that triggers the reaction of the host tissues to these pathogens, both because of the effects of the pathogen and the toxins it releases. Examples of pathogens are

• 
  Bacteria
  
• 
  Virus
  
• 
  Fungi
  
• 
  Parasites
  
• 
  
• 
  

(Image will be uploaded soon)

These pathogens can enter our bodies in several different ways such as

• 
  Through the transfer of body fluids
  
• 
  By inhaling airborne droplets or particles
  
• 
  Skin contact
  
• 
  Contact with wastes
  
• 
  Contaminated food or water
  
• 
  
•