argasid ticks. They have not been isolated from other arthropods or from vertebrates. Not reported to cause disease in humans.

Dera Ghazi Khan virus (DGKV) A species in the genus Nairovirus, belonging to the Dera Ghazi Khan serogroup. Isolated from a tick, Hyalomma dromedarii, in Pakistan. Not reported to cause disease in humans.

Dermacentor ticks The principal vector of

Colorado tick fever virus is Dermacentor andersoni, a tick which occurs above 4000 ft in the Rocky Mountains, USA. Powassan virus has also been isolated from this species of tick in South Dakota, USA.

dermovaccinia virus Strains of Vaccinia virus less virulent than others. Produce opaque white pocks on the CAM.

derriengue Mexican name for rabies in the vampire bat.

Derzsy's disease A highly contagious parvovirus disease affecting geese and Muscovy ducks first reported in China in 1956, and subsequently in many other countries. See Goose parvovirus.

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