Mesocestoides spp.

Question 1

Mesocestoides spp

Answer 1

• Mesocestoides lineatus: 30-80cm
• Mesocestoides vogae: 10-40cm
• Mesocestoides corti: 4-8cm

Question 2

IH of Mesocestoides spp

Answer 2

• 1st IH: Soil mites
• 2nd IH: Amphibians, reptiles, birds, human

Question 3

FH of Mesocestoides spp

Answer 3

carnivores

Question 4

Location of Mesocestoides spp

Answer 4

• 2nd IH: peritoneal cavity & organs
• FH: SI

Question 5

Metacestode of Mesocestoides spp

Answer 5

• 1st IH: cysticercoid
• 2nd IH: tetrathyridium

Question 6

LC of Mesocestoides spp

Answer 6

1. Gravid, motile proglottids are shed in the faeces in FH. Proglottid contain many eggs within the parauterine organ.
2. Oncospheres/proglottids are ingested by the 1st IH. The oncosphere develops into a cysticercoid inside.
3. The 2nd IH consumes the arthropod, and tetrathyridium (infective larval stage) develop in the peritoneal cavity and organs.
4. FH are infected after ingesting tetrathyridium in infected IH. Humans can be PH.
5. Tetrathyridium develops into an adult in the small intestine of FH.

PP: 16-20 days

Question 7

Morphology of Mesocestoides spp

Answer 7

Small to medium, Scolex: 4 distinct suckers, rostellum with hooks missing, 100-500 proglottids
Genital pore: 1 set, located dorsally. Parauterine organ; sac-like structure within proglottid that store fertilized eggs

Question 8

Pathogenesis of Mesocestoides spp

Answer 8

Tetrathyridium stage in car make them able to reproduce asexually, cause severe peritonitis, pleuritis and ascites.
Weak infection – asymptomatic

Peritoneal tetrathyridiosis: tetrathyridium invade peritoneal caity or other tissues (Car - abberant/2nd IH) –> peritonitis, pleuritis and ascites.

Question 9

CS of Mesocestoides spp

Answer 9

Asymptomatic, enteritis and diarrhea in strong infection. abdominal discofort/pain, peritonitis, ascites.

Question 10

Dx of Mesocestoides spp

Answer 10

• FH: Coprological, finding proglottids and eggs, flotation (Kozak-Magra)
• IH: ultrasound, CT scan, serology, PCR

Question 11

TX of Mesocestoides spp

Answer 11

IH: Fenbendazole, albendazole, surgery
FH: Praziquantel, niclozamide

Question 12

Control of Mesocestoides spp

Answer 12

Environmental sanitation, rodent destruction, insecticides

Question 13

Zoonotic Mesocestoides spp

Answer 13

Mesocestoides lineatus