Wuchereria bancrofti Continued
MICROFILARIA
SIZE: 230 to 296 mcm.
SHEATH: Present.
TAIL: Blunt.
TERMINAL NUCLEI: Do not extend to the tip of the tail.
Figure 4-30. Life cycle of Wuchereria bancrofti. (concluded)
ORGANISM 2: Brugia malayi
GENERAL CHARACTERISTICS
COMMON NAME: Malayan filariasis, elephantiasis worm.
GEOGRAPHICAL DISTRIBUTION: Worldwide, prevalent in tropics and subtropics.
PATHOGENESIS: Elephantiasis, fibrosis, thrombi, lymphatic inflammation,
granulomatous infiltration.
HABITAT: Lymphatic system.
VECTOR: Mosquitoes.
RESERVOIR HOST: None.
INFECTIVE FORM: Filariform larva.
MODE OF INFECTION: Inoculation.
PERIODICITY: Nocturnal with some subperiodic strains.
SPECIMEN OF CHOICE: Blood.
SPECIMEN PROCESSING: Giemsa's or Hematoxylin/Eosin stains.
MICROFILARIA
SIZE: 177 to 260 mcm.
SHEATH: Present.
TAIL: Swollen tip.
TERMINAL NUCLEI: Two terminal, separated nuclei.
MD0842
4-38