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Mature females of Dirofilaria immitis always pass degenerated eggs, together with microfilariae, into the blood. In order to know the degenerating process of eggs, heartworms of known age were examined for the morphology and rate of degenerated uterine eggs. In 1to 3-year-old female worms, most degenerated eggs contained atrophic embryonic cells, whereas those in worms older than these had a hypercleavaged embryo. In the younger females worms, early degenerated eggs were found at the rate of 10% in the upper one-tenth part of the uterus where normally developing eggs had about 20 cells. The rate of degenerated eggs increased in parallel with the age of mother worms and reached 100% in the older worms, which had a great deal of dust-like substance in the lowest part of the uterus. The cause of degeneration of eggs was complicated. It was thought to be abnormality in spermatozoa, ova and uterus, hyperdivision of embryonic cells, and so on. Degenerated eggs were frequently detected in blood obtained from the lungs of old infected dogs with many heartworms, although microfilariae were hardly or in small numbers detected in the peripheral blood of these dogs.

Degenerating Process of Uterine Eggs of the canine Heartworm and Their Detection from the lungs of Infected Dogs