A study on the microfilarial periodicity of Dirofilaria immitis in naturally infected dogs

Chong, Sung Fook (1986) A study on the microfilarial periodicity of Dirofilaria immitis in naturally infected dogs. [Project Paper] (Submitted)

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Abstract

Four dogs positive for the microfilariae ot Dirotilaria immitis were used for this study. Cutaneous and venous blood was collected at 3 hourly intervals tor 24 hours. The periodicity indices of microfilarial periodicity in the cutaneous blood of 46.2+9.0 was relatively higher than that of the venous blood of 31.4+14.4. Thus, it can be classified as subperiodic. The peak hours of microfilariaemia centered around 16:24+00:24 hours and 21:30+ 01:54 hours. The variability of the peak hours does not justify the classification of the microfilarial periodicity into diurnal or nocturnal. There was higher microfilarial density in the venous blood than the cutaneous blood. For the enumeration of microfilariae, the micropipette method was found to be more accurate as compared to the Knott dilution method. Significant correlation between the observed and expected microfilarial periodicity was observed in fifteen out of seventeen cases with correlation of determination values, r² ranging from 51.4% to 94.8%.

Item Type:	Project Paper
Subjects:	S Agriculture > SF Animal culture
Faculty:	Faculty of Veterinary Medicine
Depositing User:	Ms. Nordeena Abdul Aziz
Date Deposited:	30 Oct 2025 07:31
Last Modified:	30 Oct 2025 07:31
URI:	http://psaspb.upm.edu.my/id/eprint/2532

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