Treatments for Ancylostoma Braziliense
Drugs used to treat Ancylostoma Braziliense
Albenza
Stromectol
albendazole
ivermectin
What is Ancylostoma Braziliense?
Ancylostoma
braziliense is a parasitic nematode (hookworm) primarily found in dogs and cats
but occasionally affects humans. Here's a detailed breakdown of its biology, life
cycle, clinical significance, and treatment:
Classification
- Kingdom: Animalia
- Phylum: Nematoda
- Class: Secernentea
- Order: Strongylida
- Family: Ancylostomatidae
- Genus: Ancylostoma
- Species: Ancylostoma
braziliense
Morphology
1. Adult
- Small, threadlike, and pale in color.
- Males: ~8-
- Features:
- Prominent buccal cavity with two pairs
of ventral teeth.
- Males have a copulatory bursa at the
posterior end for mating.
2. Eggs:
- Oval-shaped, thin-shelled.
- Measure about 60–75 µm in length.
- Contain developing embryos that are passed
in the feces of the host.
Life Cycle
1. Eggs in Feces:
- The adult worms reside in the intestines
of dogs, cats, or other carnivores and release eggs into the environment via
feces.
2. Development in the
Environment:
- Eggs hatch into rhabditiform larvae in
warm, moist soil (optimal conditions: 25–30°C).
- These larvae molt into infectious
filariform larvae (L3) within 5–10 days.
3. Transmission:
- Infective larvae penetrate the skin of the
host.
- They migrate through tissues to reach the
lungs, ascend the trachea, and are swallowed to reach the intestines.
4. Adult Stage:
- In the intestines, larvae mature into
adults and attach to the mucosa, feeding on blood and tissue.
5. Prepatent Period:
- About 2–3 weeks, from infection to egg-laying
by adults.
Geographic Distribution
- Predominantly found in tropical
and subtropical regions.
- Common in areas like South
America, Central America, the Caribbean, Africa, and parts of
Pathogenesis in Hosts
1. Definitive Hosts (Dogs
and Cats):
- Adult worms cause hookworm disease, leading
to:
- Intestinal blood loss.
- Anemia.
- Diarrhea with blood.
- Malnutrition and lethargy in severe
cases.
2. Humans (Accidental Hosts):
- Humans typically suffer from cutaneous
larva migrans (CLM), also known as "creeping eruption."
- The larvae penetrate human skin but fail
to complete their life cycle.
- This leads to:
- Serpentine, itchy tracks on the skin.
- Erythema and secondary bacterial
infection due to scratching.
- CLM is common among people exposed to
contaminated soil, such as beachgoers and gardeners.
Clinical Manifestations
- Pale gums (due to anemia).
- Weakness and poor growth in puppies or
kittens.
- Dark, tarry stools from intestinal
bleeding.
- Intense itching and localized skin
inflammation at the site of larval migration.
- Tracks visible under the skin (can advance
by 1–2 cm per day).
Diagnosis
- Microscopic examination of feces for eggs (fecal
flotation technique).
- Diagnosis of CLM is typically clinical, based
on characteristic skin lesions and exposure history.
Treatment
1. For Animals:
- Anthelmintics like pyrantel pamoate, fenbendazole,
or ivermectin.
- Blood transfusions or iron supplements in
cases of severe anemia.
2. For Humans:
- CLM is treated with antiparasitic
medications:
- Albendazole (400 mg daily for 3–5 days).
- Ivermectin (single dose of 200 µg/kg).
- Antihistamines or topical corticosteroids
for itch relief.
- Secondary infections may require
antibiotics.
Prevention and Control
1. For Animals:
- Regular deworming of pets.
- Prompt cleaning of pet feces to prevent
larval development.
2. For Humans:
- Avoid walking barefoot or sitting directly
on contaminated soil or sand.
- Use protective gloves while gardening.
- Keep pets away from play areas and public
beaches.
Public Health Importance
While
Ancylostoma braziliense does not cause systemic infection in humans, it is a
significant cause of morbidity in tropical areas due to CLM. Proper hygiene, veterinary
care, and public awareness are critical to reducing transmission.
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