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INCUBATION
PERIOD AND LIFE SPAN:
Incubation period: 7-8 weeks (can be as long as 30 weeks in an Indian
strain).
Lifespan: A. duodenale lives 1-5 years, N. americanus can live 15-18 years (Markell 285).
MORPHOLOGY:
- A. duodenale: Head has a slight bend in relation to body.
- N. americanus: Head is sharply bent in relation to body.
- Distinguishable characteristics: N. americanus’s hook is more hooked, the buccal capsule of N. americanus has only cutting plates, while A. duodenale has teeth. N. americanus’s eggs are slightly larger, 64 – 76 mm by 36 – 40 mm.
Comparision Table
|
N.
americanus
|
A.
duodenale
|
|
| Buccal Cavity |
dorsal
and ventral cutting plates
|
2
ventral plates and 2 large teeth
|
| Size of Male |
7
- 9 mm
|
8
- 11 mm
|
| Size of Female |
9
- 11 mm
|
10
- 13 mm
|
| Position of Vulva |
midbody
|
1/3
from posterior
|
| Egg Production |
9,000/day
|
25,000/day
|
| Infection via Mouth? |
No
|
Yes
|
| Penetration through Skin? |
Yes
|
Yes
|
| Longevity |
15
years
|
5
years
|
Source: http://martin.parasitology.mcgill.ca/jimspage/biol/hookworm.htm
Necator americanus Ancylostoma duodenale
Source: http://www.dpd.cdc.gov/DPDx/HTML/imageLibrary/Hookworm_il.htm