Infectious diseases


Yaws is tropical infectious disease, which is characterized by occuring skin and bones. Earlier in tropical regions, particularly in sub-Saharan Africa, South America and South Asia, around 50 million people have been affected annually. Yaws is more common in children.


  • Papules (flat nodules) on the skin that resemble raspberries.
  • At a late stage of the disease – the changes in the bones (especially the hands and feet), the nose and throat are affected.


Yaws is caused by corkscrew moving organism, which has opened in 1905 belonging to the species Treponema pertenue. Infection occurs through direct contact with the patient. In addition, there is an assumption that yaws can be transmitted through flies kind Hippealates. The causative organism, which is located on the skin of the patient rights, can only penetrate through broken skin or mucous membranes.


Yaws is usually treated with penicillin. If the patient is allergic to the antibiotic, he is prescribed other medications, such as tetracycline or erythromycin.

How to help yourself? First of all, you should avoid any contact with patients.

If one or more pimples appear on the skin, resembling a raspberry, you should immediately consult a dermatologist.

The doctor will examine the affected skin, take a sample of tissue and examines it under a microscope, will perform a special blood test.

If untreated, the following steps occur:

Primary stage

The primary stage of the disease begins after 2-8 weeks after infection. At the location of infection (usually in the lower leg) one or more papules appear, which over time may themselves disappear.

Secondary stage

1-3 months later, the second stage of the disease – papules are distributed throughout the human body. They often appear in the vagina, anus, mouth. In addition, there are characteristic rash on the palms of the hands and feet. This rash is most often benign. Sometimes lymph nodes are greatly enhanced, there is fatigue, headaches, and fever. As a result of scratching due to severe itching, other skin infections often occur. Over time, the inflammation of the periosteum begins, there are changes in the bones and joints.

Tertiary stage

Tertiary yaws begins after about 5-20 years after infection. This stage manifests severe skin, bones and joints. This disease is characterized by scarring, which disfigure the whole body; also nose and throat are affected.

Is it a dangerous disease?

Yaws is quite contagious and dangerous disease, but it responds to treatment success. With timely treatment the patient can expect a full recovery. In addition, with the help of modern orthopedic doctors can often correct term complications, such as bone and joint disease. At the initiative of the World Health Organization (WHO) yaws is consistently treated with penicillin in all world countries. Today, the disease is almost completely eliminated.

Differences yaws from syphilis


  • Prevalent in almost all tropical regions.
  • Non-congenital.
  • Often children are affected.
  • Strong itch.
  • There is no alopecia (hair loss).
  • Internal organs and the central nervous system are not affected.


  • Prevalent in all continents.
  • Sometimes congenital.
  • Often adults are infected.
  • There is no itching.
  • Alopecia.
  • Often the internal organs and the central nervous system are affected.