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Disease Diagnosis and Treatment

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Common Associated Disease: Benign tertian malaria, vivax malaria Infective stage: sporozoites injected by mosquito during blood meal Diagnostic stage: Immature trophozoite (ring stage), mature trophozoite, schizont Vector: Female Anopheles mosquitoes Treatment: quinine, quinidine, chloroquine, dapsone

Plasmodium vivax

Common Associated Disease: Benign tertian malaria, ovale malaria Infective stage: sporozoites injected by mosquito during blood meal Diagnostic stage: Immature trophozoite (ring stage), mature trophozoite, schizont Vector: Female Anopheles mosquitoes Treatment: quinine, quinidine, chloroquine, dapsone

Plasmodium ovale

Common Associated Disease: Quartan malaria, malarial malaria Infective stage: sporozoites injected by mosquito during blood meal Diagnostic stage: Immature trophozoite (ring stage), mature trophozoite, schizont Vector: Female Anopheles mosquitoes Treatment: quinine, quinidine, chloroquine, dapsone

Plasmodium malariae

Common Associated Disease: Black water fever, malignant tertian malaria, aestivoautumnal malaria, subtertian malaria, falciparum malaria Infective stage: sporozoites injected by mosquito during blood meal Diagnostic stage: Immature trophozoite (ring stage), mature trophozoite, schizont Vector: Female Anopheles mosquitoes Treatment: quinine, quinidine, chloroquine, dapsone

Plasmodium falciparum

Common Associated Disease: x Infective stage: sporozoites injected by mosquito during blood meal Diagnostic stage: Immature trophozoite (ring stage), mature trophozoite, schizont Vector: Female Anopheles mosquitoes Treatment: quinine, artemether lumefantrine, chloroquine,

Plasmodium knowlesi

Common Associated Disease: Babesiosis Infective stage: sporozoites injected by ticks during a blood meal Diagnostic stage: trophozoite Vector: Ixodes dammini ticks Treatment: Clindamycin and quinineor atovaquone and azithromycin, Diminazene and pentamidine, combination or singly, and pyrimethamine and quinine

Babesia microti

Common Associated Disease: Babesiosis Infective stage: sporozoites injected by ticks during a blood meal Diagnostic stage: trophozoite Vector: Ixodes ricinus ticks Treatment: Clindamycin and quinineor atovaquone and azithromycin, Diminazene and pentamidine, combination or singly, and pyrimethamine and quinine

Babesia divergens

(Relative age of infected RBCs: Only young and immature cells) (Appearance of infected RBCs: Enlarged, distorted)

Plasmodium vivax

(Relative age of infected RBCs: Only young and immature cells) (Appearance of infected RBCs: Oval and enlarged, distorted with ragged cell walls)

Plasmodium ovale

(Relative age of infected RBCs: Only immature cells) (Appearance of infected RBCs: Normal size, no distortion)

Plasmodium malariae

(Relative age of infected RBCs: May infect cells of all ages) (Appearance of infected RBCs: Normal size, no distortion)

Plasmodium falciparum

(Appearance: Resembles a ring form Does not contain Schüffner’s, Ziemann’s, or Maurer’s dots) (Ring characteristics when stained with Giemsa: Blue cyto plasmic circle connected with or to red chromatin dot Vacuole usually present)

Babesia Species Trophozoite

(Appearance: Resembles four trophozoites attached by their respective chromatin dots in the shape of a Maltese cross)

Babesia Species Merozoite

(Ring form: Delicate cytoplasmic ring measuring one third of RBC diameter. Single chromatin dot Ring surrounds a vacuole. Accolé forms possible.) (Developing trophozoite: Irregular ameboid appearance Ring remnants common Brown pigment becomes apparent, increases in number and visibility as parasites mature) (Immature schizont: Multiple chromatin bodies, Often contains clumps of brown pigment) (Mature schizont: 12 to 24 merozoites occupy most of infected red blood cell Merozoites surrounded by cytoplasmic material Brown pigment maybe present) (Microgametocyte: Large pink to purple chromatin mass surrounded by colorless to pale halo Brown pigment common) (Macrogametocyte: Round to oval cytoplasm Eccentric chromatin mass Delicate light-brown pigment—maybe visible throughout cell)

Plasmodium vivax

(Ring form: Resembles that of P.vivax, Ring larger in size than P.vivax, Ring thick and ofther somewhat ameboid in appearance) (Developing trophozoite: Ring appearance usually maintained until late in development, ameboid tendecies not as evident in P. vivax) (Immature schizont: progressive dividing chromatin surrounded by cytoplasmic material - often maintains circular shape in early development) (Mature schizont: Parasites occupy 75% pf RBC's, rosette arrangement of merozoites with an average of eight merozoites typically present) (Microgametocyte: Similar to P.vivax, only smaller in size) (Macrogametocyte: Similar to Pvivax, only smaller in size)

Plasmodium ovale

(Ring form: Smaller than P.vivax, occupies one sixth of the RBC, heavy chromatin dot vacuole may appear filled in, pigment characteristically forms early) (Developing trophozoite: Non ameboid solid cytoplasm that may assume roundish, oval, band or bar shape, Cytoplasm contains coarse dark brown pigment, may mask chromatin material, vacoules absent in mature stages) (Immature schizont: Similar to that of P.vivax, only smaller, may contain large and dark peripheral or central granules) (Mature schizont: Typically contains 6 to 12 merozoites arrange in rosttes or irregular clusters, central arrangement of brown - green pigment may be visible, infected RBC may not be seen because developing parasites often fill the cell completely) (Microgametocyte: x) (Macrogametocyte: x)

Plasmodium malariae

(Ring form: Circle configuration (one chromatin dot) or headphone configuration (two chromatin dot, scanty cytoplasm, small vacuole usually visible, multiple rings common, accolé forms possible) (Developing trophozoite: Heavy rings common, Fine pigment granules, Mature forms only seen in severe infection) (Immature schizont: Multiple chromatin bodies surrounded by cytoplasm, only detected in severe infections) (Mature schizont: Typically consist of 8-36 merozoites (average, 24) in cluster arrangement, only detected in severe infections) (Microgametocyte: Sausage or crescent shaped, dispersed central chromatin with nearby black pigment usually visible) (Macrogametocyte: Sausage or crescent shaped, compact chromatin, black pigment surrounding chromatin may be visible)

Plasmodium falciparum

Study Notes

Malaria

  • Benign tertian malaria, vivax malaria, ovale malaria, quartan malaria, and malarial malaria are all associated with the same infective stage, diagnostic stage, and vector.
  • Infective stage: sporozoites injected by female Anopheles mosquitoes during a blood meal.
  • Diagnostic stage: immature trophozoite (ring stage), mature trophozoite, and schizont.
  • Vector: Female Anopheles mosquitoes.
  • Treatment: quinine, quinidine, chloroquine, and dapsone.

Falciparum Malaria

  • Associated with black water fever, malignant tertian malaria, aestivoautumnal malaria, and subtertian malaria.
  • Infective stage: sporozoites injected by female Anopheles mosquitoes during a blood meal.
  • Diagnostic stage: immature trophozoite (ring stage), mature trophozoite, and schizont.
  • Vector: Female Anopheles mosquitoes.
  • Treatment: quinine, artemether lumefantrine, and chloroquine.

Babesiosis

  • Associated with tick-borne diseases.
  • Infective stage: sporozoites injected by ticks during a blood meal.
  • Diagnostic stage: trophozoite.
  • Vector: Ixodes dammini and Ixodes ricinus ticks.
  • Treatment: Clindamycin and quinine, atovaquone and azithromycin, Diminazene and pentamidine, or pyrimethamine and quinine.

Morphology

  • Infected RBCs: enlarged, distorted, or normal size, with or without distortion.
  • Trophozoite: ring form, ameboid appearance, or irregular shape.
  • Schizont: multiple chromatin bodies, with or without brown pigment.
  • Microgametocyte: large pink to purple chromatin mass, or small, round, and compact chromatin.
  • Macrogametocyte: round to oval cytoplasm, eccentric chromatin mass, or similar to microgametocyte.

Species Characteristics

  • P. vivax: ring form with a blue cytoplasmic circle, single chromatin dot, and vacuole usually present.
  • P. ovale: ring form with a delicate cytoplasmic ring, measuring one-third of RBC diameter.
  • P. malariae: ring form with a thick, ameboid appearance, and heavy chromatin dot.
  • P. falciparum: ring form with a small, one-sixth RBC diameter, and heavy chromatin dot, with coarse dark brown pigment.
  • P. knowlesi: ring form with a circle configuration, or headphone configuration, with scanty cytoplasm, and small vacuole usually visible.

This quiz covers the diagnosis, treatment, and associated diseases, including the infective stage and vectors.

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