Leprosy

Some people get a sickness called leprosy.

Tiny germs cause this sickness. They can hurt your skin and eyes. They can also hurt your nerves. This makes parts of your body feel numb.

You can get it from someone who is sick. It can spread when they cough. But most people stay healthy.

Doctors have medicine to help. This medicine can cure the sickness. People can live with their families. They can go to school and work.

Leprosy is a long-term sickness caused by tiny germs.

These germs are called bacteria. Two types of bacteria cause the disease. One is called Mycobacterium leprae. The other is called Mycobacterium lepromatosis.

These germs can hurt your skin and your eyes. They can also hurt your nerves. Nerves are the parts of your body that send signals. When nerves are hurt, you might feel numbness. This means you cannot feel touch or heat.

If a person cannot feel pain, they might get hurt without knowing. This can lead to damage in fingers or toes.

Most people do not get sick from the germs. About 95% of people stay healthy even if they are near it. You can get it through close contact. It can spread if a sick person coughs. However, it is not highly contagious. People can live with their families and go to school.

Doctors can cure leprosy with medicine. This is called multidrug therapy. People take these medicines for six or twelve months. The World Health Organization gives this medicine for free. Many people have been cured by these drugs.

Leprosy is a long-term infection caused by tiny bacteria.

These germs are called Mycobacterium leprae and Mycobacterium lepromatosis. This sickness is also known as Hansen's disease. It matters because it can cause serious damage to the body. It can hurt the skin, the eyes, and the respiratory tract. It can even damage the nerves that send signals through the body.

The way it works often starts with nerve damage. The bacteria can bind to Schwann cells in the nerves. This leads to inflammation and a loss of nerve function. Because of this, a person might lose the ability to feel touch or heat. This loss of feeling is called a loss of nociception. If a person cannot feel pain, they might get injured without knowing it. These unnoticed wounds can lead to the loss of fingers or toes.

People have studied this disease for thousands of years. The name leprosy comes from a Greek word meaning "scale." The name Hansen's disease honors a Norwegian physician named Gerhard Armauer Hansen.

Scientists who study leprosy are called leprologists. In the past, people often treated those with leprosy poorly. They sometimes lived in separate places called leper colonies. Japan had laws to prevent leprosy, but they repealed them in 1996.

There are many important facts about how the disease spreads. It is not highly contagious and is spread through close contact. It can spread through a cough or contact with nasal fluid. However, 95% of people who are exposed do not get sick. In the 1980s, there were 5.2 million cases around the world. By 2020, this number dropped to fewer than 200,000 cases.

Most new cases happen in 14 countries. India has more than half of all new cases.

Today, leprosy is curable with a thing called multidrug therapy.

Doctors use medicines like dapsone, rifampicin, and clofazimine. People with paucibacillary disease take them for six months. People with multibacillary disease take them for 12 months. The World Health Organization provides these medicines for free. This helps people live normal lives with their families. They can go to school and work just like anyone else.

Leprosy, also called Hansen's disease (HD), is a long-term bacterial infection.

It is caused by the bacteria Mycobacterium leprae or Mycobacterium lepromatosis. This disease is significant because it can cause permanent damage to the skin, eyes, and respiratory tract. Most importantly, it can attack the nervous system.

While the infection is serious, it is not highly contagious. In fact, 95% of people who are exposed to the bacteria do not develop the disease. This is because a person's baseline immune function and genetic factors help prevent the infection from taking hold.

The mechanism of the disease centers on how the bacteria interact with the body. The bacteria are obligate intracellular pathogens, meaning they must live inside host cells to grow. They have been shown to bind to Schwann cells, which are cells that support the nerves. This binding leads to inflammation and nerve injury, such as demyelination. Demyelination is the loss of the protective coating around nerves. This causes a loss of axonal conductance, or the ability of the nerve to send signals. As a result, patients may experience a loss of nociception, which is the ability to feel pain.

Without the ability to feel pain or temperature, people may suffer unnoticed wounds. These injuries can lead to secondary bacterial or viral infections. Over time, this can cause tissue loss, making fingers and toes appear shortened or deformed.

Doctors classify leprosy into two main types based on the bacterial load. The first type is paucibacillary leprosy. A person with this type has five or fewer skin patches that are poorly pigmented and numb. The second type is multibacillary leprosy. These patients have more than five skin patches and a higher number of bacteria in their bodies. Diagnosis is confirmed through a skin biopsy. During this process, doctors look for acid-fast bacilli, which are bacteria that retain certain red stains under a microscope.

The history of leprosy is very long and spans thousands of years. The name comes from a Greek word meaning "scale." The term Hansen's disease honors the Norwegian physician Gerhard Armauer Hansen.

The study of this disease is known as leprology. Historically, the disease has been linked to social stigma. This stigma often prevented people from seeking early treatment. In some places, people were forced into leper colonies to live apart from society. While Japan repealed its Leprosy Prevention Laws in 1996, some former patients still live in sanatoriums. In the past, some people even used leper bells to warn others of their presence.

Global numbers show that leprosy is becoming much less common. In the 1980s, there were 5.2 million cases worldwide. By 2020, that number fell to fewer than 200,000 cases.

Most new cases are concentrated in just 14 countries. India is responsible for more than half of all new cases globally. Despite these challenges, the progress is huge. Between 1994 and 2014, 16 million people were cured of the disease.

Today, leprosy is a curable condition using multidrug therapy (MDT).

This treatment uses specific antibiotics to kill the bacteria. For paucibacillary leprosy, patients take dapsone, rifampicin, and clofazimine for six months. For multibacillary leprosy, the same medicines are used for 12 months. The World Health Organization provides these treatments free of charge. Once a person starts this therapy, they are considered non-infectious after 72 hours. This allows patients to live normally with their families, attend school, and go to work.

Leprosy is also a zoonotic disease, meaning it can spread between animals and humans. Research shows that armadillos can carry the bacteria. It is suspected that armadillos acquired the bacteria from European explorers.

In 2016, researchers also found the bacteria in red squirrels in Great Britain. This connection to animals shows how complex the spread of the disease can be. Understanding these links helps scientists better manage the disease in both humans and nature.