scholarly journals Transovarial transmission rates of Orientia tsutsugamushi in naturally infected Leptotrombidium colonies by immunofluorescent microscopy

2013 ◽  
Vol 64 (1) ◽  
pp. 43-46 ◽  
Author(s):  
Hiroshi URAKAMI ◽  
Koji OKUBO ◽  
Hitoko MISUMI ◽  
Masahiro FUKUHARA ◽  
Mamoru TAKAHASHI
Keyword(s):  
Transovarial Transmission ◽  
Orientia Tsutsugamushi ◽  
Transmission Rates ◽  
Immunofluorescent Microscopy

scholarly journals B15 Survey of Orientia tsutsugamushi-infection rate of trombiculid mites distributed in Kyoto Prefecture by immunofluorescent microscopy

1998 ◽  
Vol 49 (Supplement) ◽  
pp. 65
Author(s):  
H. Urakami ◽  
K. Okubo ◽  
M. Takahashi ◽  
H. Misumi ◽  
S. Nakajima ◽  
...  
Keyword(s):  
Infection Rate ◽  
Orientia Tsutsugamushi ◽  
Immunofluorescent Microscopy ◽  
Trombiculid Mites

scholarly journals Transovarial Transmission of Orientia tsutsugamushi in Leptotrombidium palpale (Acari: Trombiculidae)

PLoS ONE ◽  
2014 ◽  
Vol 9 (4) ◽  
pp. e88453 ◽  
Author(s):  
Eun Hee Shin ◽  
Jong Yul Roh ◽  
Won Il Park ◽  
Bong Gu Song ◽  
Kyu-Sik Chang ◽  
...  
Keyword(s):  
Transovarial Transmission ◽  
Orientia Tsutsugamushi

Scrub typhus (Orientia tsutsugamushi), A rapidly spreading epidemic in Chennai - A standalone lab experience

2016 ◽  
Vol 5 (09) ◽  
pp. 4896
Author(s):  
Sripriya C.S.* ◽  
Shanthi B. ◽  
Arockia Doss S. ◽  
Antonie Raj I. ◽  
Mohana Priya
Keyword(s):  
Scrub Typhus ◽  
Clinical Symptoms ◽  
Clinical Manifestations ◽  
Febrile Illness ◽  
Orientia Tsutsugamushi ◽  
The Past ◽  
Igm Elisa ◽  
The Mean ◽  
Specific Symptoms ◽  
Symptoms And Signs

Scrub typhus (Orientia tsutsugamushi), is a strict intracellular bacterium which is reported to be a recent threat to parts of southern India. There is re-emergence of scrub typhus during the past few years in Chennai. Scrub typhus is an acute febrile illness which generally causes non-specific symptoms and signs. The clinical manifestations of this disease range from sub-clinical disease to organ failure to fatal disease. This study documents our laboratory experience in diagnosis of scrub typhus in patients with fever and suspected clinical symptoms of scrub typhus infection for a period of two years from April 2014 to April 2016 using immunochromatography and IgM ELISA methods. The study was conducted on 648 patients out of whom 188 patients were found to be positive for scrub typhus. Results also showed that pediatric (0 -12 years) and young adults (20 – 39 years) were more exposed to scrub typhus infection and female patients were more infected compared to male. The study also showed that the rate of infection was higher between September to February which also suggested that the infection rate is proportional to the climatic condition. Statistical analysis showed that the mean age of the patients in this study was 37.6, standard deviation was 18.97, CV % was 50.45. 

scholarly journals Tick Ecdysteroid Hormone, Global Microbiota/Rickettsia Signaling in the Ovary versus Carcass during Vitellogenesis in Part-Fed (Virgin) American Dog Ticks, Dermacentor variabilis

2021 ◽  
Vol 9 (6) ◽  
pp. 1242
Author(s):  
Loganathan Ponnusamy ◽  
Haley Sutton ◽  
Robert D. Mitchell ◽  
Daniel E. Sonenshine ◽  
Charles S. Apperson ◽  
...  
Keyword(s):  
Hormonal Regulation ◽  
Natural Populations ◽  
Blood Feeding ◽  
Dermacentor Variabilis ◽  
Transovarial Transmission ◽  
Rickettsia Species ◽  
Adult Females ◽  
Dog Tick ◽  
Total Bacteria

The transovarial transmission of tick-borne bacterial pathogens is an important mechanism for their maintenance in natural populations and transmission, causing disease in humans and animals. The mechanism for this transmission and the possible role of tick hormones facilitating this process have never been studied. Injections of physiological levels of the tick hormone, 20-hydroxyecdysone (20E), into part-fed (virgin) adult females of the American dog tick, Dermacentor variabilis, attached to the host caused a reduction in density of Rickettsia montanensis in the carcass and an increase in the ovaries compared to buffer-injected controls. This injection initiates yolk protein synthesis and uptake by the eggs but has no effect on blood feeding. Francisella sp. and R. montanensis were the predominant bacteria based on the proportionality in the carcass and ovary. The total bacteria load increased in the carcass and ovaries, and bacteria in the genus Pseudomonas increased in the carcass after the 20E injection. The mechanism of how the Rickettsia species respond to changes in tick hormonal regulation needs further investigation. Multiple possible mechanisms for the proliferation of R. montanensis in the ovaries are proposed.

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