Detection of a novel Rickettsia from Leptotrombidium
scutellare mites (Acari: Trombiculidae) from Shandong of China.
It is transmitted by the chigger mite Leptotrombidium
The most abundant chiggers belonged to the Walchai species (26.9%) followed by chiggers from Ascoschoengastia sp (33.3%), Leptotrombidium
sp (21.7%), and Scheogastia sp (13.5%).
Scrub typhus is an acute febrile infection transmitted by the bite of leptotrombidium
, chigger mite larvae.
For instance, in the South Pacific, Oceania, and Asia trombiculid mites of the genus Leptotrombidium
are known to be vectors of tsutsugamushi, also known as scrub typhus.
 When an infected trombiculid mite ("chiggers," Leptotrombidium
deliense) bites, the disease gets transmitted to the humans.
The infectious disease is spread by some species of trombiculid mites, particularly Leptotrombidium
Only biting larvae of Asian scrub typhus chiggers (Leptotrombidium
species) transmit scrub typhus caused by Orientia tsutsugamushi (formerly Rickettsia tsutsugamushi); and only biting house mouse mites (Liponyssoides sanguineus) transmit rickettsialpox caused by Rickettsia akari.
Parthenogenesis Trombiculidae Leptotrombidium
arenicola Traub, 1960 Scorpiones Parthenogenesis Buthidae Ananteris coinaui Lourenco 1982, Hottentota hottentota Fabricius 1787, Tityus columbianus Thorell 1876, Tityus metuendus Pocock 1897, Tityus stigmurus Thorell 1876, Tityus trivittatus Kraepelin 1898, Tityus uruguayensis Borelli, 1901 Parthenogenesis Hemiscorpiidae Liocheles australasiae Fabricius, 1775 * Opiliones Parthenogenesis Caddidae Acropsopilio chomulae Goodnight & Goodnight 1948 Parthenogenesis Phalangiidae Leiobunum globosum Suzuki 1953, Leiobunum manubriatum Karsch 1881 Araneae Absence of males Symphytognathidae Anapistula caecula Baert & or strongly Jocque 1993 biased sex-ratio Absence of males Araneidae Hypognatha spp.
Parasite Location Prevalence (a) Apicomplexa Eimeria pilarensis NM 1/12 (8%) Eimeria rioarribaensis NM 4/22 (18%) MX (b) 1/21 (5%) Trematoda Plagiorchis micracanthos SD 1/1 (100%) Nematoda Longibucca lasiura CAN (d) 1/10 (10%) Acari Leptotrombidium
myotis SD not stated MT 1/6 (17%) OR not stated Macronyssidae (nymphs) CA 1/1 (100%) (c) Macronyssus crosbyi NM 1/1 (100%) Ornithodoros sp.
In contrast, the field rat, which is the primary host of the Leptotrombidium
mite, is spreading throughout this area, which may explain the wide distribution of ST.
Laboratory tests of arthropod repellents against Leptotrombidium
deliense--noninfected and infected with Rickettsia tsutsugamushi--and noninfected L.