A parasite is an organism that lives on or in another organism and benefits from the host’s resources. Parasitic organisms can be obligate parasites, which depend on a host to survive; facultative parasites, which can live independently but may choose to parasitize a host when it suits them; or ectoparasites, which live externally on their hosts.

Anthrax Disease: Symptoms, Prevention & Treatment

Anthrax disease is an infectious disease of animals that is also transmitted to man. This disease is also known as Carbuncle. Anthrax or anthrax is a disease that forms by the Spora bacterium Bacillus anthracis. The name of the bacterium derives from the Greek term for coal, due to ulcers with dark centers that develop on the skin of the affected people. Anthrax is present in all continents, with high …

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Tick: Dangerous External Parasites

Ticks are macroscopic mites, obligate parasites as they only feed on the blood of their hosts. The tick is one of the oldest arachnids, a few years ago historians got a tick that dates from 20 to 30 million years old. This species was trapped in sage. I remain in perfect fossilized conditions. Its life cycle is complex, with several evolutionary phases, and in the process of biting can transmit …

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Fly Insect: A Terrestrial Insect

The fly is a terrestrial insect, with a great presence in the environment that belongs to the Insecta class and the Diptera order. The most common part of the Muscidae family and found in most regions of the world. Its scientific name is Musca domestic. The earliest known fossils of flies are amber from the Baltic, that is, from 35-40 million years ago. The insect lived 20 million years ago …

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Roundworm: Symptoms, Prevention & Treatment

Roundworm is microscopic, multicellular, semitransparent organisms, worm-shaped, non-segmented, superficially ringed, with bilateral symmetry, possess all organic systems, except the respiratory and circulatory systems. The Roundworm is a type of Nematode (a phylum that includes the earthworms, which are not true worms). Roundworms can be found in many different types of environments. They live off of plants and other animals, so they need to find ways to get into these hosts. …

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Chickenpox: Symptoms, Prevention & Treatment

Chickenpox is a highly contagious viral infection. Nowadays Chickenpox is not danger diseases for the human. Chickenpox is more severe in adults. Adults susceptible to infection in the form of Chickenpox usually have more lesions and associated complications such as pneumonia. Chickenpox is a highly contagious disease caused by the varicella-zoster virus (VZV). Chickenpox causes an itchy, blister-like rash. The rash first appears on the chest, back, and face, and …

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Lice: Symptoms, Prevention & Treatment

Lice are parasites that live on people’s heads and are very common. They predominantly affect children between the ages of 3 and 10 and their relatives. They are very easily spread. Girls are affected with head lice in greater proportion than children because they have long hair. Lice are tiny wingless insects that live on human scalps and feed exclusively on blood. Lice can be found anywhere in the world, …

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