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Pathogenic bacteria are bacteria that can cause disease. This article deals with human pathogenic bacteria. Although most bacteria are harmless or often beneficial, some are pathogenic, with the number of species estimated as fewer than a hundred that are seen to cause infectious diseases in humans. By contrast, several thousand species exist in the human digestive system.


Pathogenic bacteria can be grouped into three categories on the basis of their invasive properties for eukaryotic cells (Fig. 7-4; Table 7-3). Although some bacteria (e.g., Rickettsia , Coxiella , and Chlamydia ) grow only inside host cells, others (e.g., Salmonella , Shigella , and Yersinia ) are facultative intracellular pathogens, invading ...


Pathogenic bacteria are a major cause of human death and disease and cause infections such as tetanus, typhoid fever, diphtheria, syphilis, cholera, foodborne illness, leprosy and tuberculosis. A pathogenic cause for a known medical disease may only be discovered many years after, as was the case with Helicobacter pylori and peptic ulcer disease .


Bacteria are all around us, in the air, on objects and normally found in and on the human body. When bacteria is on the human body in the absence of disease, it is called a colonizer. However, people can get infected from pathogenic bacteria from food, water, abrasions and other wounds and even from ...


Start studying major groups of pathogenic bacteria. Learn vocabulary, terms, and more with flashcards, games, and other study tools.


What Are the Different Types of Pathogens? Pathogens are any type of bacteria, virus or fungi that causes disease in humans, according to Education Portal. These three types of organisms all have subspecies that may attack humans and cause them to become sick.


Matthew Eriquezzo Rabies is an RNA Virus caused by contact with infected saliva or other bodily fluids. Rabies targets the Brain and Spinal Cord. Symptoms: headache, fever, weakness, anxiety, confusion, agitation, delirium, abnormal behavior, hallucination, and insomnia. Rabies


Different types of pathogens include bacteria, viruses, protists (amoeba, plasmodium, etc.), fungi, parasitic worms (flatworms and roundworms), and prions. While these pathogens cause a variety of illness ranging from minor to life-threatening, it is important to note that not all microbes are pathogenic.


Bacteria are single-celled microorganisms, known for their tremendous ability to adapt and multiply as well as for their ancient history. Some of the oldest known fossils--nearly 3.5 billion years old--are those of bacteria-like organisms.


1 Chapter 11: Bacteria Bacterial Groups u Most widely accepted taxonomic classification for bacteria is Bergey’s Manual of Systematic Bacteriology. u 5000 bacterial species identified, 3100 classified. u Bacteria are divided into four divisions (phyla) according to the characteristics of their cell walls. u Each division is divided into sections according to: