| [is dirofilariasis in dogs spreading in south switzerland?]. | microfilarial infections could be detected by the difil test in 11 (2.2%) of 479 blood samples of clinically asymptomatic dogs from the south of switzerland. dirofilaria repens and d. immitis were identified in 3 (0.6%) and 8 dogs (1.6%), respectively, by the acid phosphatase activity of the microfilariae. 10 dogs with microfilaremia had been abroad or a stay outside switzerland could not be excluded. one dog diagnosed with d. immitis could have had acquired the infection in the canton tessin ac ... | 1998 | 9646715 |