Schistosomiasis

Tiny worms can live in fresh water.

These worms live inside small snails. They can get into a person's skin. This can make your skin very itchy.

It can also make your tummy hurt. Some people feel very sick too. We can stay safe with clean water. Doctors can also give medicine to help.

Schistosomiasis is a disease caused by tiny worms.

These worms are called schistosomes. They live in fresh water. They often come from snails.

People can get sick by touching this water. The worms can go through the skin. This might cause an itchy red rash. Some people call this swimmer's itch.

Once inside, the worms move through the body. They can live in the belly or the bladder. This can cause tummy pain or blood in the urine. If the sickness lasts a long time, it can hurt the liver. It can also hurt the kidneys. In children, it might make it hard to grow well.

Doctors can find the disease by looking for eggs. They look in a person's urine or stool. There is a medicine called praziquantel. It helps kill the adult worms. To stay safe, people need clean water. We can also help by reducing the number of snails in the water. This disease is common in parts of Africa, Asia, and South America.

Schistosomiasis is a serious disease caused by tiny parasitic flatworms.

These worms are called schistosomes. People often call this illness snail fever or bilharzia. It is a neglected tropical disease that affects many humans and animals. The worms usually live in the urinary tract or the intestines.

This sickness can cause many different problems for the body. Some people feel very sick with fever and muscle aches. Others might have pain in their bellies or blood in their urine. In children, it can even make it hard to grow or learn.

This disease spreads through contact with certain types of fresh water.

First, parasites are released from infected freshwater snails into the water. When a person touches this water, the tiny larvae can enter the skin. This often causes an itchy, red rash called swimmer's itch.

Once inside, the worms migrate through the body's blood and lungs. They eventually settle into places like the liver or the intestines. There, the adult worms lay eggs that move through the body. These eggs can cause inflammation or damage to many different organs.

Doctors use special ways to find out if someone is sick. They can look for the parasite's eggs in a person's urine or stool.

They can also check the blood for antibodies against the disease. If the infection is long-term, it can lead to very serious issues. The eggs can cause damage to the liver, kidneys, or even the bladder. In some bad cases, eggs might even travel to the brain or spinal cord. This could cause things like seizures or even paralysis.

Schistosomiasis is very common in parts of Africa, Asia, and South America.

In 2019, about 236.6 million people around the world were impacted by it. It is estimated that between 4,400 and 200,000 people die from it every year. About 700 million people live in places where this disease is found. In tropical regions, it is the second most important parasitic disease after malaria. Children are often at higher risk because they play in the water. Women are also at risk when they fetch water or wash clothes.

There are ways to help stop the spread of these worms. One way is to improve access to clean water for everyone.

Another way is to reduce the number of snails in the water. The World Health Organization recommends a medicine called praziquantel for those who are sick. In some areas, doctors give this medicine to entire groups once a year. This helps lower the total number of people who have the worms. By doing this, the disease cannot spread as easily from person to person.

Schistosomiasis is a significant neglected tropical disease caused by parasitic flatworms known as schistosomes.

These parasites belong to a group of infections called helminthiasis. The disease primarily affects the human urinary tract or the intestines. It can also impact many other animal species. Because it is widespread and affects millions, it is a major global health concern. In tropical regions, it is the second most economically significant parasitic disease, following malaria.

The infection begins when a person comes into contact with fresh water. This water contains cercariae, which are the larval forms of the parasite. These larvae are released from infected freshwater snails into the water.

When cercariae penetrate the skin, they can cause cercarial dermatitis. This is often called "swimmer's itch" and appears as an itchy, red, maculopapular rash. This rash can include flat lesions, raised pimples, or small blisters. For people who have been infected before, the immune response is stronger. This leads to a faster and more severe skin reaction.

After entering the skin, the parasites undergo several stages of development. The cercariae transform into schistosomulae. These young worms migrate through the bloodstream and the lungs. Eventually, they reach organs like the liver or the intestines to become adult worms.

The adult worms then lay eggs within the host. These eggs secrete proteolytic enzymes to help them migrate through tissues. This migration is necessary for the eggs to be shed in urine or stool. However, the movement of these eggs can also cause serious damage to the body.

Infections can be categorized into acute and chronic stages. Acute schistosomiasis, also known as Katayama fever, occurs 2 to 8 weeks after infection. This stage is a systemic reaction to the migrating worms and their antigens. Symptoms include fever, fatigue, muscle aches, cough, and diarrhea. It can also cause enlargement of the liver or spleen.

If the eggs migrate to the brain or spinal cord, neurological complications like seizures or paralysis may occur. Chronic infection happens when the disease persists for a long time. In this stage, the body's immune system reacts to eggs trapped in various tissues.

Chronic intestinal schistosomiasis is caused by species like *S. mansoni* and *S. japonicum*. These worms live in the veins of the gastrointestinal tract. When eggs get trapped in the intestinal wall, they cause a granulomatous reaction. This immune response can lead to abdominal pain, bloody stool, and diarrhea. Severe cases can result in intestinal polyps, ulcers, or even a complete bowel obstruction. In children, this can lead to poor growth and learning difficulties.

Chronic hepatic schistosomiasis affects the liver and spleen. This occurs when eggs become lodged in the liver, leading to fibrosis.

This scarring can cause portal hypertension and an enlarged spleen. In severe cases, it can lead to esophageal varices, which are swollen areas in the esophagus. These can tear and cause heavy bleeding. The disease can also cause fluid buildup in the abdomen. Such complications can be life-threatening for those with long-term, heavy infections.

Schistosomiasis is a massive global health challenge. In 2019, it impacted approximately 236.6 million individuals. It is estimated that between 4,400 and 200,000 people die from the disease each year. About 700 million people live in regions where the disease is prevalent. These regions are mostly located in Africa, Asia, and South America.

Children and women are often at higher risk due to water exposure during play or daily chores.

Medical professionals use several methods to manage and prevent the disease. Diagnosis is made by finding parasite eggs in urine or stool, or by detecting antibodies in the blood. The World Health Organization recommends the medication praziquantel for infected individuals.

In some areas, praziquantel is given to entire groups once a year to reduce the number of infected people. Prevention also involves improving access to clean water and reducing the number of snails in the environment.