Dawaa Reference

Clinical reference

Chagas Disease (American Trypanosomiasis)

Treatment options, dosing, cautions and Egyptian brands from the shipped Dawaa Reference card.

Evidence status

Checked against the sources named below

Sources3 sources

Chagas Disease - StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK459272/ · ICPC-3 (WONCA International Classification of Primary Care, 3rd edition) class AD24.01 - condition scope only, no dose · No dose - referral pathway, no medicine given in primary care

Verified against1 document
  • No dose - referral pathway, no medicine given in primary care

Verified date2026-08

Presentation reference

Is it this?

Reference only, to read alongside your own examination.

Symptoms — what the patient reports (6)

  • Patients rarely recall or mention the triatomine bug bite itself
  • Acute illness often brings fever, localized swelling, enlarged lymph nodes, muscle aches, pallor, breathlessness and abdominal or chest pain [abdominal pain · breathlessness · chest pain · fever · lymphadenopathy · muscle pain · pallor]
  • A minority develop an anaphylactic-type reaction to the bite, with hives, flushing, wheeze, nausea, vomiting and diarrhea [diarrhoea · nausea · urticaria · vomiting · wheeze]
  • Congenital transmission can cause prematurity, low birth weight, fever, anemia and reduced muscle tone [anaemia · fever]
  • Chronic cardiac disease can present with fever, an enlarged heart, apical aneurysms, ECG changes, or frank heart failure [fever]
  • Chronic GI-phase Chagas can present with fever, megaesophagus, megacolon and constipation [constipation · fever]

Signs — what you find (5)

  • One-sided conjunctivitis with purplish eyelid swelling, called Romana sign or a chagoma, is a hallmark finding [eyelid swelling]
  • Cardiomegaly can show up as a displaced apical impulse, narrowed pulse pressure or sinus tachycardia [tachycardia]
  • Right heart failure can bring bibasilar lung crackles and pitting swelling of both legs [crackles]
  • The abdomen can be distended but soft, with quiet bowel sounds, and rectal exam may find impacted stool
  • Exam may find an enlarged liver and spleen plus conjunctival pallor from chronic anemia [anaemia · hepatomegaly · pallor]

Tests (7)

  • Acute diagnosis relies on seeing the parasite by microscopy in fresh anticoagulated blood or buffy coat
  • PCR can turn positive days to weeks before a routine blood smear picks up circulating parasites
  • ECG, chest x-ray and echocardiography can all show cardiomegaly, and echo can reveal a reduced ejection fraction
  • ECG often shows first-degree AV block and atrial flutter or fibrillation, plus conduction defects such as right bundle branch block or left anterior fascicular block
  • Abdominal x-rays can show bowel pseudo-obstruction or an enlarged megacolon
  • Barium swallow or enema studies can be used to further evaluate GI symptoms
  • Chronic infection is confirmed by finding IgG antibodies against T. cruzi

If not this — what else fits (11)

  • Esophageal motility disorders belong on the differential list
  • Esophageal rupture belongs on the differential list
  • Esophageal spasm belongs on the differential list
  • Esophagitis belongs on the differential list
  • Gastroesophageal reflux disease belongs on the differential list
  • Leishmaniasis belongs on the differential list
  • Malaria belongs on the differential list
  • Meningitis belongs on the differential list
  • Myocardial infarction belongs on the differential list
  • Myocardial rupture belongs on the differential list
  • Congestive heart failure belongs on the differential list

SourceStatPearls "Chagas Disease" - disease-level clinical article

Presentation findings are traced to the source above.

1

NO DRUG THERAPY IN PRIMARY CARE (RECOGNITION & REFERRAL)

1st line
Adult dose and duration

Chronic protozoal infection spread by triatomine ('kissing') bugs found only in the Americas. Not a Cairo diagnosis except in someone who lived in or travelled extensively through Latin America; the specific drugs (benznidazole, nifurtimox) are not marketed in Egypt, so any suspected case needs referral to a tropical medicine centre. - Refer

Paediatric dose

Children follow the same pathway: recognise and refer. No primary-care medicine is implied.

Dose source

No dose - referral pathway, no medicine given in primary care

Why

Chronic protozoal infection spread by triatomine ('kissing') bugs found only in the Americas. Not a Cairo diagnosis except in someone who lived in or travelled extensively through Latin America; the specific drugs (benznidazole, nifurtimox) are not marketed in Egypt, so any suspected case needs referral to a tropical medicine centre.

Cautions
  • Not endemic in Egypt. Relevant to a returning traveller or an imported case; consider the travel history before anything else.
  • No medicine is prescribed for this in primary care - this entry is for recognition and referral. Anything given is decided by the service it is referred to.
  • RED FLAG - An acute febrile illness with periorbital swelling (Romana's sign) after a relevant exposure, or unexplained cardiomyopathy, megacolon or megaoesophagus in a patient with a relevant Latin American residence history: refer for specialist assessment.

Prices are indicative (dataset snapshot 2026-06); verify with the pharmacy.