Question

Compare and contrast Dirofilaria immitis and Acanthocheilonema reconditum. Specifically, explain the morphological differences between the two microfilarial forms. 


Answer 1

Dirofilaria immitis

it is found globally.it is mostly found where mosquitoes exist for sufficient periods to incubate infective larvae.

• usually many in blood,stationary,straight body and tail,tapered head,307-322um.
• tail maybe straight or hooked.
• They are long slender ,white worms.
• males-5-7 inches long with a corkscrew tail
• females 12-15inches long and produce microfilaria.
• Microfilaria of D irofilaria immitis are usually greater in number and move,but not progressively.
• Best diagnosed with Ag test.

Acanthocheilonema reconditum

• usually few in blood,progressive motion,curved body,blunt head ,curved or button -hook tail ,250-288um.
• it is not pathogenic.
• it is shorter (246-293 microns)
• do not have a tapered anterior end.
• has a clear cephalic space.
• microfilaria of Acanthocheilonema reconditum is lesser in number