Rickettsioses: Difference between revisions

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{| class="wikitable"
{| class="wikitable"
! Species
!Species
!Disease
! Vector
!Vector
!Geographic Area
!Eschar
!Rash
!Lymphadenopathy
!Other Symptoms
!Mortality
|-
|-
! colspan=2 | Rickettsiae: Spotted fever group
! colspan="9" |Rickettsiae: Spotted Fever Group (Tick-Borne)
|-
|-
| ''[[R. rickettsii]]'' || Tick
|''[[Rickettsia rickettsii]]''
|[[Rocky Mountain spotted fever]]
|Multiple ''[[Dermacentor]]'', ''[[Amblyomma]]'', and ''[[Rhipicephalus]]''
|Americas
|rare
|yes; centripetal
|no
|fever
|>15%
|-
|-
| ''[[R. conorii]]'' || Tick
|''[[Rickettsia conorii]]''
|[[Boutonneuse fever]], [[Mediterranean spotted fever]]
|''[[Rhipicephalus sanguineus]]''
|Southern Europe, Africa, and southern Asia
|frequent
|maculopapular
|no
|fever
|2-7%
|-
|-
| ''[[R. japonica]]'' || Tick
|''[[Rickettsia africae]]''
|[[African tick-bite fever]]
|''[[Amblyomma hebraeum]]'' and ''[[Amblyomma variegatum]]''
|Africa and the West Indies
|frequent and often multiple
|papular or vesicular; may be absent
|yes
|fever
|≤1%
|-
|-
|''[[Rickettsia parkeri]]''
| ''R. sibirica'' || Tick
|[[maculatum disease]]
|''[[Amblyomma maculatum]]''
|Americas
|yes
|often
|yes
|fever
|≤1%
|-
|-
|''[[Rickettsia japonica]]''
| ''R. australis'' || Tick
|[[oriental spotted fever]]
|''[[Dermacentor]]'', ''[[Haemaphysalis]]'', or ''[[Ixodes]]''
|Asia
|yes
|yes
|
|
|
|-
|-
|''[[Rickettsia sibirica]] mongolitimonae''
| ''R. slovaca || Tick
|
|[[Rhipicephalus sanguineus]]
|Europe, Africa and Asia
|yes
|yes
|
|
|
|-
|-
| ''[[R. africae]]'' || Tick
|''[[Rickettsia sibirica]] sibirica''
|
|''[[Dermacentor]]''
|Asia or southern Russia
|yes
|yes
|
|
|
|-
|-
|''[[Rickettsia australis]]''
| ''R. honei'' || Tick
|
|''[[Ixodes]]''
|Australia
|yes
|yes, vesicular
|
|
|
|-
|-
|''[[Rickettsia slovaca]]''
| ''R. aeschlimanii'' || Tick
|[[tick-borne lymphadenopathy]]
|''[[Dermacentor marginatus]]''
|Europe
|yes, often on scalp
|
|regional lymphadenopathy
|
|
|-
|-
|''[[Rickettsia honei]]''
| ''R. helvetica'' || Tick
|
|''[[Bothriocroton]]'', ''[[Haemaphysalis]]'', ''[[Ixodes]]'', or ''[[Rhipicephalus]]''
|Flinders Islands, eastern Australia, Thailand, or Nepal
|yes
|yes
|
|
|
|-
|-
| ''[[R. parkeri]]'' || Tick
|''[[Rickettsia aeschlimanii]]''
|
|''[[Hyalomma]]'' or ''[[Rhipicephalus]]''
|Africa and Europe
|yes
|yes
|
|
|
|-
|-
|''[[Rickettsia helvetica]]''|| ||ticks
| ''R. heilongjianghensis'' || Tick
|
|
|
| ||
|
|-
|-
|''[[Rickettsia heilongjianghensis]]''
| ''R. raoultii'' || Tick
|
|''[[Dermacentor]]'' or ''[[Haemaphysalis]]''
|Asia
|yes
|yes
|
|
|
|-
|-
|''[[Rickettsia raoultii]]''
| ''R. massiliae'' || Tick
|
|''[[Dermacentor]]''
|Europe
|yes, often on scalp
|
|regional lymphadenopathy
|
|
|-
|-
|''[[Rickettsia massiliae]]''
| ''R. amblyommii'' || Tick
|
|[[Rhipicephalus sanguineus]]
|Europe, Africa, and the Americas
|yes
|yes
|
|
|
|-
|-
| ''R. monacensis'' || Tick
|''[[Rickettsia amblyommii]]''|| ||ticks
|
|
|
| ||
|
|-
|-
|''[[Rickettsia monacensis]]''|| ||ticks
| ''R. philipii'' strain 364D || Tick
|
|
|
| ||
|
|-
|-
|''[[Rickettsia philipii]]'' strain 364D
| ''R. felis'' || Flea
|
|''[[Dermcentor occidentalis]]''
|California
|yes, often on scalp
|
|regional lymphadenopathy
|
|
|-
|-
! colspan="9" |Rickettsiae: Spotted Fever Group (Flea-, Louse, and Mite-Borne)
| ''[[R. akari]]'' || Mite
|-
|-
|''[[Rickettsia felis]]''
! colspan=2 | Rickettiae: Typhus group
|
|Flea
|flea exposure
|yes
|yes
|
|
|
|-
|-
|''[[Rickettsia akari]]''
| ''[[R. typhi]]'' || ''Xenopsylla cheopis'' (rat flea) and ''Ctenocephalides felis'' (cat flea)
|[[rickettsialpox]]
|''[[Liponyssoides sanguineus]]'' house mouse mites
|worldwide
|yes
|yes, vesicular
|yes
|fever
|≤1%
|-
|-
! colspan="9" |Rickettsiae: Typhus Group
| ''[[R. prowazekii]]'' || ''Pediculus humanus corporis'' (human body louse)
|-
|-
|''[[Rickettsia typhi]]''
! colspan=2 | Rickettsiae: Scrub typhus group
|[[Endemic typhus|endemic (murine) typhus]]
|''[[Xenopsylla cheopis]]'' (rat flea) and ''[[Ctenocephalides felis]]'' (cat flea)
|tropics or subtropics, with flea exposure
|may or may not
|yes, centrifugal
|
|
|
|-
|-
|''[[Rickettsia prowazekii]]''
| ''[[Orientia tsutsugamushi]]'' || Chiggers (trombiculid mites)
|[[Epidemic typhus|epidemic (louse-borne) typhus]]
|''[[Pediculus humanus humanus]]'' (human body louse) and the fleas and live of flying squirrels
|United States, especially homeless shelters
|no
|yes, centrifugal
|no
|fever
|≤1% to >15%
|-
|-
! colspan=2 | Anaplasma
! colspan="9" |Rickettsiae: Scrub Typhus Group
|-
|-
| ''[[A. phagocytophilum]]'' | Tick
|''[[Orientia tsutsugamushi]]''
|[[scrub typhus]]
|[[Leptotrombidium]] mites (chiggers, trombiculid mites)
|Asian Pacific, Chile, and Dubai
|yes
|yes
|
|
|
|-
|-
! colspan=2 | Ehrlichia
! colspan="9" |Anaplasma
|-
|-
|''[[Amblyomma phagocytophilum]]''
| ''[[E. chaffeensis]]'' || ''Amblyomma americanum'' ticks (the Lone Star tick)
|[[human granulocytotropic anaplasmosis]]
|ticks
|
|
|
|
|
|
|-
|-
! colspan="9" |Ehrlichia
| ''[[E. ewingii]]'' || ''A. americanum'' and ''Dermacentor variabilis'' ticks
|-
|-
|''[[Ehrlichia chaffeensis]]''
| ''E. canis'' || Tick
|[[human monocytotropic ehrlichiosis]]
|''[[Amblyomma americanum]]'' ticks (the Lone Star tick)
|
|
|
|
|
|
|-
|-
|''[[Ehrlichia ewingii]]''
! colspan=2 | Other
|[[human monocytotropic ehrlichiosis]]
|''[[Amblyomma americanum]]'' and ''[[Dermacentor variabilis]]'' ticks
|
|
|
|
|
|
|-
|-
| ''Neoehrlichia mikurensis'' || Tick
|''[[Ehrlichia canis]]''|| ||ticks
|
|
|
| ||
|
|-
|-
! colspan="9" |Other Related Organisms
| ''Neorickettsia sennetsu'' || Raw fish
|-
|-
|''[[Neoehrlichia mikurensis]]''|| ||ticks
| ''Wolbachia'' || Helminths
|
|
|
| ||
|
|-
|''[[Neorickettsia sennetsu]]''|| ||raw fish
|
|
|
| ||
|
|-
|''[[Wolbachia]]''|| ||helminths
|
|
|
| ||
|
|}
|}

==Diagnosis==

*The mainstay of diagnosis is '''serology'''
**Indirect immunofluorescence antibody assays of IgG antibodies
***IgM do not appear any earlier in the course of disease and are less specific
**Usually as acute and convalescent titres drawn 2 to 4 weeks apart showing a 4-fold increase in titres
***[[Rickettsia africae]] may take up to 4 weeks after onset of illness to seroconvert
**Cross-reactivity is common within each group
***Serologic tests for [[Rickettsia conorii]] or [[Rickettsia rickettsii]] may be used to diagnosis other spotted fever group diseases such as [[Rickettsia africae]], [[Rickettsia akari]], [[Rickettsia australis]], and [[Rickettsia sibirica]]
***Serologic tests for [[Rickettsia typhi]] may be used to diagnose other typhus group diseases such as [[Rickettsia prowazekii]]
***Cross-reactivity also common between the two groups, but the titres will usually be highest in the group containing the causative organism
*'''PCR''' is becoming more widely available
**Blood and tissue (e.g. eschar biopsy)
**Done as PCR for the group followed by species-specific sequencing

==Management==

*First-line for essentially all infections is [[Is treated by::doxycycline]] 100 mg po BID, continue for 3 days following resolution of symptoms
*Alternatives include [[Is treated by::azithromycin]] and [[Is treated by::chloramphenicol]]

==Further Reading==

*Syndromic classification of rickettsioses: an approach for clinical practice. ''Int J Infect Dis''. 2014;28:126-39. doi: [https://doi.org/10.1016/j.ijid.2014.05.025 10.1016/j.ijid.2014.05.025]


[[Category:Rickettsioses]]
[[Category:Rickettsioses]]

Latest revision as of 04:37, 8 February 2022

Species Disease Vector Geographic Area Eschar Rash Lymphadenopathy Other Symptoms Mortality
Rickettsiae: Spotted Fever Group (Tick-Borne)
Rickettsia rickettsii Rocky Mountain spotted fever Multiple Dermacentor, Amblyomma, and Rhipicephalus Americas rare yes; centripetal no fever >15%
Rickettsia conorii Boutonneuse fever, Mediterranean spotted fever Rhipicephalus sanguineus Southern Europe, Africa, and southern Asia frequent maculopapular no fever 2-7%
Rickettsia africae African tick-bite fever Amblyomma hebraeum and Amblyomma variegatum Africa and the West Indies frequent and often multiple papular or vesicular; may be absent yes fever ≤1%
Rickettsia parkeri maculatum disease Amblyomma maculatum Americas yes often yes fever ≤1%
Rickettsia japonica oriental spotted fever Dermacentor, Haemaphysalis, or Ixodes Asia yes yes
Rickettsia sibirica mongolitimonae Rhipicephalus sanguineus Europe, Africa and Asia yes yes
Rickettsia sibirica sibirica Dermacentor Asia or southern Russia yes yes
Rickettsia australis Ixodes Australia yes yes, vesicular
Rickettsia slovaca tick-borne lymphadenopathy Dermacentor marginatus Europe yes, often on scalp regional lymphadenopathy
Rickettsia honei Bothriocroton, Haemaphysalis, Ixodes, or Rhipicephalus Flinders Islands, eastern Australia, Thailand, or Nepal yes yes
Rickettsia aeschlimanii Hyalomma or Rhipicephalus Africa and Europe yes yes
Rickettsia helvetica ticks
Rickettsia heilongjianghensis Dermacentor or Haemaphysalis Asia yes yes
Rickettsia raoultii Dermacentor Europe yes, often on scalp regional lymphadenopathy
Rickettsia massiliae Rhipicephalus sanguineus Europe, Africa, and the Americas yes yes
Rickettsia amblyommii ticks
Rickettsia monacensis ticks
Rickettsia philipii strain 364D Dermcentor occidentalis California yes, often on scalp regional lymphadenopathy
Rickettsiae: Spotted Fever Group (Flea-, Louse, and Mite-Borne)
Rickettsia felis Flea flea exposure yes yes
Rickettsia akari rickettsialpox Liponyssoides sanguineus house mouse mites worldwide yes yes, vesicular yes fever ≤1%
Rickettsiae: Typhus Group
Rickettsia typhi endemic (murine) typhus Xenopsylla cheopis (rat flea) and Ctenocephalides felis (cat flea) tropics or subtropics, with flea exposure may or may not yes, centrifugal
Rickettsia prowazekii epidemic (louse-borne) typhus Pediculus humanus humanus (human body louse) and the fleas and live of flying squirrels United States, especially homeless shelters no yes, centrifugal no fever ≤1% to >15%
Rickettsiae: Scrub Typhus Group
Orientia tsutsugamushi scrub typhus Leptotrombidium mites (chiggers, trombiculid mites) Asian Pacific, Chile, and Dubai yes yes
Anaplasma
Amblyomma phagocytophilum human granulocytotropic anaplasmosis ticks
Ehrlichia
Ehrlichia chaffeensis human monocytotropic ehrlichiosis Amblyomma americanum ticks (the Lone Star tick)
Ehrlichia ewingii human monocytotropic ehrlichiosis Amblyomma americanum and Dermacentor variabilis ticks
Ehrlichia canis ticks
Other Related Organisms
Neoehrlichia mikurensis ticks
Neorickettsia sennetsu raw fish
Wolbachia helminths

Diagnosis

  • The mainstay of diagnosis is serology
    • Indirect immunofluorescence antibody assays of IgG antibodies
      • IgM do not appear any earlier in the course of disease and are less specific
    • Usually as acute and convalescent titres drawn 2 to 4 weeks apart showing a 4-fold increase in titres
    • Cross-reactivity is common within each group
  • PCR is becoming more widely available
    • Blood and tissue (e.g. eschar biopsy)
    • Done as PCR for the group followed by species-specific sequencing

Management

Further Reading

  • Syndromic classification of rickettsioses: an approach for clinical practice. Int J Infect Dis. 2014;28:126-39. doi: 10.1016/j.ijid.2014.05.025
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