Common ticks found in HK includes Rhipicephalus sanguineous (Brown dog tick) and Boophilus microplus and they belong to the family IXODIDAE with size around 1/8″ (dark brown to black color). Ticks are efficient vectors of number of serious dieases of humans and domestic animals i.e. Q fever and boutonneuse fever etc. Ticks are arthropods, like spiders. Ticks occur in two basic forms and are thus divided into two famialies: Ixodidae (Hard tick), and Argasidae (Soft tick). Hard and soft, when describing ticks, refers to presence or absence of a hard plate on their back, called scutum. Ticks are bloodsucking ectoparasites of mammals, reptiles and birds.