<prompt> The vector that transmits disease caused by both Rickettisia orientia:Rat fleaTickLouseTrombiculid mite  <response>: Ans: D Trombiculid The answer would be trombiculid mite as it transmit both Rickettsia! disease Rickettsial-pox Oriential disease scrub typhus -Park 20th672The family Rickettisiaceae comprises 3 genera- Rickettsia. Orientia Ehrlichia. Genus orientia Orientia tsutsugamushi cause scrub typhus. The vector is trombiculid mites belonging to the genus of Leptatrombidium - L akamushi in japan L deliensis in India- Ananthnarayan 8th406,408Table: Arthropod-borne diseasesAnthropodDisease transmittedMosquito15Malaria, filaria, viral encephalitis e.g., japanese encephalitis, viral fevers e.g., dengue, West Nile, viral haemorrhagic fevers e.g, yellow fever, dengue haemorrhagic feverHouseflyTyphoid and paratyphoid fever, diarrhoea, dysentery, cholera, gastroenteritis, amoebiasis, helminthic infestations, poliomyelitis, conjunctivitis, trachoma, anthrax, yaws, etc.SandflyKala-azar, oriental sore, sandfy fever, oraya fever.Tsetse flySleeping sicknessLouseEpidemic typhus, relapsing fever, trench fever, pediculosisRat fleaBubonic plague, endemic typhus, chiggerosis, hvmenolepis diminuataBlackflyOnchocerciasis.Reduviid bugChagas disease.Hard tickTick typhus, viral encephalitis, viral fevers, viral haemorrhagic fever, e.g., Kyasanur forest disease, tularemia, tick paralysis, human babesiosis.Soft tickQ fever, relapsing fever.Trombiculid miteScrub typhus, Rickettsial-pox.Itch-miteScabies.CyclopsGuinea-worm disease, fish tapeworm D. latus.CockroachesEnteric pathogens.Table Ananthnarayan 8th406: Human disease caused by Rickettsia Orientia speciesDiseasesRickettsial agentInsect vectorsMammalian reserviors1. Typhus group Epidemic typhus Murine typhus Endemic TyphusR. prowazeki R. typhLouse FleaHumans Rodents Scrub typhusR. tsutsugamushfiMiteRodents2. Spotted fever groc Indian tick typhus Rocky Mountain spotted fever c. Rickettsial poxR. conomR. rickettsi R. akarTickTickMiteRodents, dogsRodents, dogsMice3. Others Q. feverC. burnetiiExtra Human: Sift tick Humans : NilCattle, sheep, goats Trench feverRochalimaea quintanaLouseHumans 