COXIELLA BURNETI IN KANGAROOS AND KANGAROO TICKS IN WESTERN QUEENSLAND

Abstract

SUMMARY Complement‐fixing antibodies to Coxiella burneti were present in 23 p.c. of kangaroos collected in western Queensland, and agglutinins in 15 p.c. Red kangaroos, Megaleia rufa, showed a higher incidence of complement‐fixing antibodies (33 p.c.) than grey kangaroos, Macropus major (12 p.c.). In three areas, the incidence of complement‐fixing antibody in M. rufa was between 46 and 54 p.c. C. burneti was isolated in mice from the blood of one Macropus major. Thirteen isolations were made from nearly 3,000 ornate kangaroo ticks, Amblyomma triguttatum, collected from kangaroos, goats and sheep. The titre of infectivity of infected ticks for mice was usually in the range 10−6 to 10−9. Infection of kangaroos and A. triguttatum was found over a considerable area, between 24 and 28° S. and 144 and 149° E., in western Queensland. It thus seems probable that a natural kangaroo‐tick cycle exists. The three‐host life cycle and wide host range of this tick would allow it to spread infection to domestic animals as well as kangaroos. Infestation of sheep would bring infected ticks into contact also with workers in the sheep‐shearing industry, and was probably responsible for recent outbreaks of Q fever among them.

Endemic Q Fever in New South Wales, Australia: A Case Series (2005–2013)

“…35 Two species of kangaroos in western Queensland were shown to be seropositive for C. burnetii, and isolates of C. burnetii were made from their ticks, Amblyomma triguttatum, the ornate kangaroo's tick. 36 A patient in western Australia developed Q fever pericarditis after being bitten by kangaroo ticks. 37 Macropod seropositivity to C. burnetii in Queensland and western Australia has been reported.…”

A survey of Western Australian sheep, cattle and kangaroos to determine the prevalence of Coxiella burnetii

“…An earlier study in Australia (Pope et al, 1960) that suggested that the 7 kangaroo tick, Amblyomma triguttatum, may be responsible for the transfer of C. burnetii 8 between host species and future work testing ticks for C. burnetii DNA may be warranted. A c c e p t e d M a n u s c r i p t bacterial loads were not detected.…”

The drop-off rhythm of Amblyomma triguttatum triguttatum Koch (Acari: Ixodidae) from laboratory hosts

“…It is involved in the epidemiology of Q-fever (Pope et al, 1960) and the larvae cause an allergic dermatitis in man (Moorhouse, 1981). This tick species is widely distributed in eastern Australia (Roberts, 1962) where it normally attaches to the ears of hosts (Guglielmone, 1990).…”