Throughout history, microorganisms, the causative organisms for infectious diseases have been playing an active role. Many native populations during the middle Ages have been destroyed by plagues. The Europeans when tried to conquer Australia, Africa and Americas had initially used microorganisms to destroy the native populations.
Microbes or Microorganisms Microorganisms may be single-celled like bacteria, some algae and protozoa, or multicellular, such as algae and fungi. Microorganisms like amoeba can live alone, while fungi and bacteria may live in colonies.
There are more microorganisms present in us than there are cells, and the various microorganisms are bacteria, viruses, fungi and protozoa. Many people link microorganisms as death and diseases causing agents; also usually compared to dirt.Microorganisms and Disease Worksheet - EdPlace This worksheet helps to student to review their understanding of the way in which diseases are caused by microorganisms, how man has tried to combat their effects and what is good practice in dealing with them.The reason was that there was no 'germ theory'. They had no idea of the existence of microorganisms and no idea that some of these were pathogenic (create infectious diseases). Microorganisms are microscopic, living, single-celled organisms such as bacteria. Sometimes people refer to viruses as microorganisms, which they are not.
Germ theory was crucial in identifying many diseases caused by microbes and in finding ways to prevent them through measures such as immunization, sanitation, and improved living conditions. By the mid-1960s many experts concluded that infectious disease was all but conquered and researchers could shift their focus to chronic medical conditions such as heart disease and cancer.Read More
Microorganisms: Definition, Types and Importance! A. What are Microorganisms? Microorganisms (Gk: micros: small; organisms: organisms) or microbes are living forms, whose size is so small that they are usually not visible to naked human eye. B. Types of Microorganisms: Microorganisms include bacteria, viruses, protozoa, microscopic fungi and algae.Read More
Such microorganisms are known as harmful microorganisms. Bacteria are the most dangerous of all microorganisms and are responsible for several infectious diseases such as tuberculosis, cholera, diptheria, etc. Viruses are also responsible for certain fatal diseases such as AIDS, influenza, etc. Fungi are also harmful and can lead to certain skin infections and allergies.Read More
Prions are linked to human diseases such as Creutzfeldt-Jacob disease (a rare form of dementia) and possibly Alzheimer disease. Most Resistant form of life known are Prions Prions are highly resistant to heat, chemical agents, and irradiation.There is no treatment or vaccine against prion diseases, and the only preventive measure is not eating suspect food.Read More
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Infectious plant diseases are caused by bacteria, fungi, or viruses and can range in severity from mild leaf or fruit damage to death. The following is a list of some of the major plant diseases, grouped by type of causative agent and ordered alphabetically.Read More
The scientific study of disease is called pathology, from the Greek “pathos” meaning suffering.Pathology is concerned with the cause of disease, called the etiology (the agent of disease is the etiologic agent).It also deals with pathogenesis, the manner in which a disease develops.Pathology is also concerned with the structural and functional changes brought about by the disease in tissues.Read More
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