Nematodes

Pinworn, seat worm, society worm

Pinworn, seat worm, society worm

Enterobius vermicularis

Hookworms

1. Ancylostoma duodenale

2. Necator americanus

Serpent worm, Guinea worm, Dragon worm

Dracunculus medinensis

large intestinal roundworm, roundworm of man

Ascaris lumbricoides

Pork muscle roundworm

Trichinella spiralis

Whipworm

Trichuris trichiura

Threadworm

Strongyloides stercoralis

Old world hookworm

Ancylostoma duodenale

new world hookworm

Necator americanus

Infective stage: embryonated egg

1. Enterobius vermicularis

2. Trichuris trichiura

3. Ascaris lumbricoides

4. Capillaria philippinensis

Infective stage: filariform larva (L3)

1. Necator americanus

2. Ancylostoma duodenale

3. Strongyloides stercoralis

4. Dracunculus medinensis

Infective stage: inhalation

1. Enterobius vermicularis

Diagnostic stage: encysted larvae in affected skeletal muscle

Trichinella spiralis

Diagnostic stage: Rhabditiform larvae (L1) infected ulcers

Dracunculus medinensis

Diagnostic stage: Rhabditiform larvae (L1) stool w/zinc or sputum

Strongyloides stercoralis

Diagnostic stage: egg/ova in stool

1. Enterobius vermicularis

2. Ascaris lumbricoides

3. Capillaria philippinensis

MOT: ingestion of poorly cooked infected meat

1. Trichinella spiralis

MOT: ingestion of embryonated egg

1. Ascaris lumbricoides

2. Enterobius vermicularis

3. Trichuris trichiura

MOT: Skin penetration

1. Necator americanus

2. Ancylostoma duodenale

3. Strongyloides stercoralis

Habitat: Small intestine

1. Ascaris lumbricoides

2. Acylostoma duodenale

3. Necator americanus

4. Strongyloides stercoralis

Habitat: Large intestine

1. Trichuris trichiura

2. Enterobius vermicularis

Filarial worms

1. Wuchereria bancrofti

2. Brugia malayi

3. Loa loa

4. Mansonella ozzardi

5. Mansonella perstans

6. Onchocerca volvulus

Uses intermediate hosts

Fialriae nematodes

Viviparous females

hatches larvae directly

Retroinfection (autoinfection)

1. Enterobius vermicularis

2. Strongyloides stercoralis

Location: Lymphatic

1. Wuchereria bancrofti (lower)

2. Brugia malayi (lower)

Location: Subcutaneous tissue

1. Loa loa

2. Onchocerca vovulus

Location: Serous cavity

1. Mansonella ozzardi

2. Mansonella perstans

Bancrofti’s filariae

Wuchereria bancrofti

Malayan filariae

Brugia malayi

Infective stage to man: L3

1. Wuchereria bancrofti

2. Brugia malayi

3. Loa loa

4. Onchocerca volvulus

5. Mansonella ozzardi

Infective stage to vector: Microfilaria

1. Wuchereria bancrofti

2. Brugia malayi

3. Loa loa

4. Onchocerca volvulus

5. Mansonella ozzardi

Diagnostic stage: microfilaria in blood

1. Wuchereria bancrofti

2. Brugia malayi

3. Loa loa

4. Onchocerca volvulus

5. Mansonella ozzardi

skin penetration through vectors

Wuchereria bancrofti

Definitive host: man

1. Wuchereria bancrofti

2. Brugia malayi

3. Loa loa

4. Onchocerca volvulus

5. Mansonella ozzardi

Reservoir host of Brugia malayi

macaques, leaf monkeys

Intermediate host spec. Brugia malayi

mansonia spp.

Intermediate host spec. Wuchereria bancrofti

aedes

Collection time: 12mn (nocturnal)

1. Wuchereria bancrofti

2. Brugia malayi

skin penetration through bloodlumen

Brugia malayi

skin pentration by mango flies

Loa loa

Diurnal periodicity

Loa loa

Blinding worm/Convolutes filaria

Onchocerca volvulus

intermediate hos Loa loa

mangrove, deer, chrysops fly

Intermediate host Onchocerca volvulus

simulium (black fly/buffalo gnat)

skin penetration by black flies

Onchocerca volvulus

New world or Ozzardi’s filaria

Mansonella ozzardi

skin pentration by culicoides gnats

1. Mansonella ozzardi

2. Mansonella perstans

intermediate host: culicoides gnats (biting midges)

1. Mansonella ozzardi

2. Mansonella perstans

reservoir host: African primate

1. Mansonella ozzardi

2. Mansonella perstans

Old world or Perstan’s filariae

Mansonella perstans

Oviparous females

1. HOOKWORMS

2. A. lumbricoides

3. Trichiuris trichiura

Oviviparous females

1. E. vermicularis

2. S. stercoralis

Viviparous females

1. D. medinensis

2. T. spiralis

3. F

Bagsang, Birut, Bactu, Ipon, Bagsit

Capillaria philippinensis