Case 188. 

Microfilaria of Dirofilaria immitis in the peripheral blood of dog
　 　 　 　
　 The microfilaria of D. immitis, 200-300 μm in length, is unsheathed. Compare with the sheathed brugian and loian microfilaria. Carrier dogs are often asymptomatic. 　
　 　 　 　

　

 　 Regarding the incidental infestation of D. immitis microfilaria in humans, refer to cases 97 and 194.