Classification of ascaris spp
What is the classification of Ascaris?
The Chromadorea are a class of the roundworm phylum, Nematoda. They contain a single subclass and several orders. With such a redundant arrangement, the Chromadoria are liable to be divided if the orders are found to form several clades, or abandoned if they are found to constitute a single radiation.
What are the types of ascariasis?
An estimated 807 million–1.2 billion people in the world are infected with Ascaris lumbricoides (sometimes called just Ascaris or ascariasis). Ascaris, hookworm, and whipworm are parasitic worms known as soil-transmitted helminths (STH). Together, they account for a major burden of parasitic disease worldwide.
What is the scientific name of Ascaris?
Ascaris is a genus of roundworms under the phylum Nematoda. They are typically small-intestinal parasites. The most common species that affects humans is the Ascaris lumbricoides.
What are characteristics of Ascaris?
Adults of Ascaris lumbricoides are large roundworms. Females measure 20–35 cm long with straight taisl; males are smaller at 15–31 cm and tend to have curved tails. Adults of both sexes possess three “lips” at the anterior end of the body.
What is the infection of Ascaris called?
Ascariasis worm
Ascariasis (as-kuh-RIE-uh-sis) is a type of roundworm infection. These worms are parasites that use your body as a host to mature from larvae or eggs to adult worms. Adult worms, which reproduce, can be more than a foot (30 centimeters) long.
Which disease is caused by Ascaris?
Ascariasis is caused by ingesting infective eggs. This can happen when hands or fingers that have contaminated dirt on them are put in the mouth or by consuming vegetables or fruits that have not been carefully cooked, washed or peeled.
Is Ascaris a pseudocoelomate?
The body cavity of Ascaris is not covered by mesoderm on all sides. It is covered externally by muscles (mesoderm) but internally the lining of the intestine (endoderm). So, it is regarded as a pseudocoelomate.
What is the difference between female and male Ascaris?
Ascaris is dioecious, which means it has separate sexes. Males and females are morphologically distinct. Females are longer than males. Posterior ends of males are hooked or curved while females have a straight posterior end.
What are the characteristic features of the eggs of Ascaris?
Diagnostic Tests:
The diagnosis is established by finding characteristic eggs in the feces. Eggs are elliptical in shape, measure 30 by 50 pm, and have a rough, wavy, albuminous coat over their shell. They are highly resistant and may remain viable up to 6 years.
What is the difference between male and female Ascaris?
Ascaris is dioecious, which means it has separate sexes. Males and females are morphologically distinct. Females are longer than males. Posterior ends of males are hooked or curved while females have a straight posterior end.
Where Ascaris is found?
Their eggs are deposited in feces and soil. Plants with the eggs on them infect any organism that consumes them. A. lumbricoides is the largest intestinal roundworm and is the most common helminth infection of humans worldwide.
What is ectopic ascariasis?
The presence of Ascaris worms in unusual sites (i.e. sites other than the jejunum of the small intestine) arises when migrating larvae end up in ectopic sites, when adult worms wander into small orifices including the bile duct, the hepatic duct branches, the parenchyma or the pancreas, and when through perforated …
Is Ascaris a hookworm?
Hookworm, Ascaris, and whipworm are known as soil-transmitted helminths (parasitic worms). Together, they account for a major burden of disease worldwide. An estimated 807-1,221 million people in the world are infected with Ascaris lumbricoides (sometimes called just “Ascaris”).
What is the life cycle of an Ascaris?
Life Cycle:
Upon reaching the small intestine, they develop into adult worms. Between 2 and 3 months are required from ingestion of the infective eggs to oviposition by the adult female. Adult worms can live 1 to 2 years.
Is Ascaris a pseudocoelomate?
The body cavity of Ascaris is not covered by mesoderm on all sides. It is covered externally by muscles (mesoderm) but internally the lining of the intestine (endoderm). So, it is regarded as a pseudocoelomate.
What is the treatment of ascariasis?
Treatment. Ascariasis is treated with albendazole, mebendazole, or ivermectin. Dosage is the same for children as for adults. Albendazole should be taken with food.
Which are the two hosts of Ascaris?
Human beings are infected by these worms when they consume food or water that is contaminated by Ascaris worm eggs. Human beings and swines are primary hosts for Ascaris.
What are the characteristic features of the eggs of Ascaris?
Diagnostic Tests:
The diagnosis is established by finding characteristic eggs in the feces. Eggs are elliptical in shape, measure 30 by 50 pm, and have a rough, wavy, albuminous coat over their shell. They are highly resistant and may remain viable up to 6 years.
What is the intermediate host of Ascaris?
Ascaris is a monogenic i.e., they complete its life cycle in a single host (man) where they develop and moult, no intermediate host is required to complete the life cycle.
Why are the eggs of Ascaris called Mammillated?
These eggs of Ascaris are round and possess a thick layer of a protein coat with a rippled surface. The eggshell along with the external layer is stained with bile juice. Due to the presence of this protein coat and the rippled surface with small protuberance the egg of Ascaris lumbricoides is called mammilla eggs.
What are the risk factors of ascariasis?
Risk factors for ascariasis include:
- Poor socioeconomic conditions.
- Use of human feces as fertilizer.
- Lack of hand washing.
- Eating unwashed fruits and vegetables.
- Environmental contamination with feces.