Pathogen.
A plant pathologist discovered an infectious RNA particle smaller than a virus that causes diseases in plants. He called it a viroid. Millions each year are lost by these viroids. These contain only RNA.
A prion is a small infectious particle that contains a misfolded protein. These contain no DNA or RNA. These cause Creutzfeldt-Jakob disease, Scrapie in sheep and Kuru. These are deadly and progressive nerve wasting diseases.A plant pathologist discovered an infectious RNA particle smaller than a virus that causes diseases in plants. He called it a viroid. Millions each year are lost by these viroids. These contain only RNA.These two are the smallest infectious particles. They are not called microorganisms because they are not alive any more than viruses are.
N/aA pathogen by definition is a disease causing organism
Anthrax
After a person has had a disease, the lymphocytes remain to produce more antibodies for that pathogen if the disease is encountered again. This is called IMMUNITY.
A long lasting and non-infectious disease is called a CHRONIC Disease.
Infectious Disease. (No, I am not being sarcastic) The study of disease is called pathology. The study of , say, the infectious disease Hepatitis would be under Hepatology. (Study of the liver and diseases involving the liver) The study of viruses would be called "virology".
Its called "pathogen".
A plant pathologist discovered an infectious RNA particle smaller than a virus that causes diseases in plants. He called it a viroid. Millions each year are lost by these viroids. These contain only RNA.
It is indeed caused by a micro-organism transferable from an infected person to a susceptible contact. However it is the least infectious of all infectious diseases. Immunity of the human beings against the invading pathogenic organism is very high. In this respect leprosy differs from most infectious diseases.Dr R Ganapati,Bombay leprosy Projecte-mail : rganapati@yahoo.com
The disease which is spread from person to person is called infectious disease. For example flu is a viral disease through which the other person is infected from the patient
bacteria, and other infectious agents are called pathogens. This also includes viruses, even though they technically aren't organisms
An infectious agent is a pathogen (germ). There are six kinds of infectious agents.Here they are listed:BactiriaVirusFungiHelminthPrionProtizoa.
if the disease is caude by a microorganism, this is called ( infection
Polio
Usually a 'disease' doctor is called a Physician or Internist. Â
Infectious disease specialists are physicians who completed additional post-graduate training in the diagnosis and treatment of infectious diseases. They are typically called in as consultants to assist with treatment decisions.