24. Family Rickettsiaceae Flashcards

1
Q

Spp. under the genus Orientia

A

Orientia tsutsugamushi

Formerly classified as Rickettsia

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2
Q

Microscopic appearance of Rickettsia

A

Gram-negative-like cell wall

Contains LPS

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3
Q

Rickettsia has no apparent genes for

A

Sugar metabolism
Lipid synthesis
Amino acid synthesis

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4
Q

Groups of Rickettsia according to antigens

A

Spotted fever group
Typhus group
Scrub typhus group

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5
Q

Disease caused by Rickettsia

A

Rocky Mountain Spotted Fever (RMSF)

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6
Q

Principal reservoir of R. rickettsii

A

Hard tick

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7
Q

MOT of RMSF

A

Bite of an infected tick

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8
Q

Major laboratory test for Rickettsia

A

Serology:

  • Weil-Felix test
  • Immunofluroscent antibody (IFA) reagent
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9
Q

Diagnosis for Rickettsia in skin biopsies

A

Fluorescent

PCR

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10
Q

Genera under the Family Rickettsiaceae

A

Orientia

Rickettsia

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