Rickettsia conorii: Difference between revisions
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Rickettsia conorii
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| − | * A tickborne rickettsial species that causes boutonneuse fever |
+ | * A tickborne rickettsial species that causes '''boutonneuse fever''', the most severe form of rickettsial spotted fever next to [[Rocky Mountain spotted fever]] |
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| − | == |
+ | == Background == |
| + | === Microbiology === |
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| + | * Species of ''[[Rickettsia]]'' within the spotted fever group |
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| + | === Life Cycle === |
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| + | * Maintained transovarially within the tick species |
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| + | |||
| + | === Epidemiology === |
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* Founds in India, Pakistan, Israel, Russia, Georgia, Bulgaria, Turkey, Ukraine, Ethiopia, Kenya, South Africa, Morocco, and southern Europe |
* Founds in India, Pakistan, Israel, Russia, Georgia, Bulgaria, Turkey, Ukraine, Ethiopia, Kenya, South Africa, Morocco, and southern Europe |
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| + | * More cases occur during the warm months (July through September in the Mediterranean) |
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== Clinical Presentation == |
== Clinical Presentation == |
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| + | * Incubation period of 7 days |
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| − | |||
| + | * Initial symptoms include fever, myalgias, and headache |
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| − | * Often has an eschar at the site of tick bit |
+ | * Often has an eschar at the site of tick bit inoculation ('''"tache noir"'''), but not always |
* Petechial rash, GI symptoms, obtundation, tachypnea, hepatomegaly, leukocytosis, coagulopathy, AKI, bilirubin elevation, AST elevation, and CK elevation |
* Petechial rash, GI symptoms, obtundation, tachypnea, hepatomegaly, leukocytosis, coagulopathy, AKI, bilirubin elevation, AST elevation, and CK elevation |
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* Procoagulant, and 10% develop DVT |
* Procoagulant, and 10% develop DVT |
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* Can present as acute pancreatitis |
* Can present as acute pancreatitis |
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* Can be quite severe with higher mortality than others in the spotted fever group |
* Can be quite severe with higher mortality than others in the spotted fever group |
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| + | |||
| + | == Management == |
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| + | * First-line: [[Is treated by::doxycycline]] 100 mg po bid for 7 days |
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| + | ** May be able to shorten to a single day with two doses |
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| + | ** Could use [[Is treated by::minocycline]]) |
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| + | * [[Is treated by::Ciprofloxacin]] may be considered, but may be associated with a more severe course |
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| + | * [[Is treated by::Azithromycin]] or [[Is treated by::clarithromycin]] may be considered in pregnant women or children |
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{{DISPLAYTITLE:''Rickettsia conorii''}} |
{{DISPLAYTITLE:''Rickettsia conorii''}} |
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Revision as of 21:35, 13 March 2020
- A tickborne rickettsial species that causes boutonneuse fever, the most severe form of rickettsial spotted fever next to Rocky Mountain spotted fever
- Also known as Marseilles fever, Mediterranean spotted fever, Kenya tick typhus, Israeli tick typhus, Astrakhan spotted fever, and Indian tick typhus
Background
Microbiology
- Species of Rickettsia within the spotted fever group
Life Cycle
- Maintained transovarially within the tick species
Epidemiology
- Transmitted by Rhipicephalus sanguineus ticks
- Founds in India, Pakistan, Israel, Russia, Georgia, Bulgaria, Turkey, Ukraine, Ethiopia, Kenya, South Africa, Morocco, and southern Europe
- More cases occur during the warm months (July through September in the Mediterranean)
Clinical Presentation
- Incubation period of 7 days
- Initial symptoms include fever, myalgias, and headache
- Often has an eschar at the site of tick bit inoculation ("tache noir"), but not always
- Petechial rash, GI symptoms, obtundation, tachypnea, hepatomegaly, leukocytosis, coagulopathy, AKI, bilirubin elevation, AST elevation, and CK elevation
- Procoagulant, and 10% develop DVT
- Can present as acute pancreatitis
- Can be quite severe with higher mortality than others in the spotted fever group
Management
- First-line: doxycycline 100 mg po bid for 7 days
- May be able to shorten to a single day with two doses
- Could use minocycline)
- Ciprofloxacin may be considered, but may be associated with a more severe course
- Azithromycin or clarithromycin may be considered in pregnant women or children
