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Pathogenic bacteria are bacteria that can cause disease. [ 1 ] This article focuses on the bacteria that are pathogenic to humans. Most species of bacteria are harmless and are often beneficial but others can cause infectious diseases. The number of these pathogenic species in humans is estimated to be fewer than a hundred. [ 2 ]
The Bactrian camel shares the genus Camelus with the dromedary (C. dromedarius) and the wild Bactrian camel (C. ferus).The Bactrian camel belongs to the family Camelidae. [1] [5] The ancient Greek philosopher Aristotle was the first European to describe the camels: In his 4th century BCE History of Animals he identified the one-humped Arabian camel and the two-humped Bactrian camel.
Bacterial cellular morphologies are the shapes that are characteristic of various types of bacteria and often key to their identification. Their direct examination under a light microscope enables the classification of these bacteria (and archaea). Generally, the basic morphologies are spheres (coccus) and round-ended cylinders or rod shaped ...
Staphylococcus aureus. Colorized scanning electron micrograph of a human neutrophil ingesting MRSA. Methicillin-resistant Staphylococcus aureus (MRSA) is a group of gram-positive bacteria that are genetically distinct from other strains of Staphylococcus aureus. MRSA is responsible for several difficult-to-treat infections in humans.
Human pathogen. A human pathogen is a pathogen (microbe or microorganism such as a virus, bacterium, prion, or fungus) that causes disease in humans. The human physiological defense against common pathogens (such as Pneumocystis) is mainly the responsibility of the immune system with help by some of the body's normal microbiota.
The dromedary (Camelus dromedarius UK: / ˈdrʌmɪdəri, ˈdrɒm -/ or US: /- ˌdɛri /; 2 3), also known as the dromedary camel, Arabian camel, 4 or one-humped camel, is a large camel, of the genus Camelus, with one hump on its back. It is the tallest of the three species of camel; adult males stand 1.8–2.4 m (5 ft 11 in – 7 ft 10 in) at ...
v. t. e. SARS-CoV-2, the causative agent of COVID-19, was first introduced to humans through zoonosis (transmission of a pathogen to a human from an animal), and a zoonotic spillover event is the origin of COVID-19 that is considered most plausible by the scientific community. [a] Human coronaviruses including SARS-CoV-2 are zoonotic diseases ...
Other organisms invariably cause disease in humans, such as Rickettsia, which are obligate intracellular parasites able to grow and reproduce only within the cells of other organisms. One species of Rickettsia causes typhus, while another causes Rocky Mountain spotted fever.