Chagas disease

Background

• Endemic in rural parts of South America and Central America
  • Rare cases found in Southern United States
• Caused by the parasite trypanosoma cruzi
  • The parasite is transmitted in the feces of the host vector
    • When the vector bites, it also defecates and the parasites enter the blood stream through the bite wound

Transmission

• Disease of poverty
  • Spread by the Triatominae bug (also known as the kissing bug)
    • The Triatomina bug thrives in housing that is old, has thatched roofs and dwellings where the roof does not abut the wall.
• Other methods of transmission
  • Vertical (mother to child)
  • Transfusion/organ donation

Clinical Features

Acute phase

• Romañas sign
  • swelling of the eye thought to be secondary to rubbing the feces into the eye
• Chagoma
  • Localized swelling at the area of parasite entry
• Non-specific signs and symptoms
  • Fever, fatigue, myalgias, headache, anorexia, vomiting, diarrhea
• Serious complications
  • Myocarditis, encephalitis

Chronic phase

• Between 20-40% of patients will develop chronic complications
• Cardiac complications
  • Dilated cardiomyopathy
  • Dysrhythmias
• GI complications
  • Megaesophagus
  • Megacolon
  • Achalasia
• Neuro symptoms
  • Neuritis

Diagnosis

• Blood smear
  • Can visualize parasites
• Blood tests
  • PCR, ELISA, immunoflorescence

Work-Up

• EKG
• Blood smear
• PCR, ELISA, Etc

Treatment

• Benznidazole
• Symptomatic treatment

Source

http://www.cdc.gov/parasites/chagas/treatment.html Wikipedia:Chagas_disease Wikipedia:Triatominae