(Midterms) Microbio Exam - Transmission

Question 1

Ascaris lumbricoides

Answer 1

1. Soil-transmitted
2. Airborne
3. Ingestion of embryonated eggs (infective
   stage)

Question 2

Necator americanus

Answer 2

Active skin penetration of filariform larvae

Question 3

Anyclostoma duodenale

Answer 3

Active skin penetration of filariform larvae

Question 4

Trichuris trichiuria

Answer 4

Ingestion of embryonated eggs

Question 5

Enterobius vermicularis

Answer 5

Ingestion of embryonated eggs
Inhalation of eggs

Question 6

Strongyloides stercoralis

Answer 6

1. Larvae penetrate though skin
2. Autoinfection: Larvae penetrate intestinal
   wall directly without leaving host and migrate
   to the lungs

Question 7

Capillaria philippinensis

Answer 7

ingestion of infected fish with L3 larvae

Question 8

Trichinellas spiralis

Answer 8

Ingestion of encysted larvae
often found in raw pork

Question 9

Wuchereria bancrofti

Answer 9

Mosquito bite (Vector) containing L3 Larva

Question 10

Brugia malayi

Answer 10

Mosquito bite (Vector) containing L3 Larva

Question 11

Taenia solium

Answer 11

1. Ingest undercooked pork
   containing larvae stage
2. Ingestion of eggs: results in
   cysticercosis

Question 12

Taenia saginata

Answer 12

Ingest undercooked
beef containing
larvae stage

Question 13

Diphyllobothrium latum

Answer 13

Ingest larvae in raw freshwater
fish

Question 14

Echinococcus granulosus

Answer 14

Ingestion of fertilized egg in
food contaminated with dog
feces (Dog is the definitive
host)

Question 15

Clonorchis sinensis

Answer 15

ingestion of raw or
undercooked freshwater fish
containing metacercariae

Question 16

Plasmodium species

Answer 16

Arthropod-transmitted:
Bite of Anopheles mosquito containing
sporozoites

Question 16

Fasciola hepatica

Answer 16

ingestion of raw, fresh-water
vegetation with encysted
metacercariae

Question 17

Schistosoma

Answer 17

direct penetration of the skin
by cercariae (mature larvae)

Question 18

Trypanosoma cruzi

Answer 18

Arthropod-transmitted: Transmitted
by the Reduviid bug/Triatoma (kissing
bug)
Contaminated blood transfusion

Question 18

Trypanosoma brucei
gambiense

Answer 18

Arthropod-transmitted: Bite of
tsetse fly (Glossina species)
Contaminated blood transfusion

Question 19

Entamoeba histolytica

Answer 19

Ingestion of fecally-contaminated
food or water containing mature or
quadrinucleate cyst
Venereal transmission through
fecal-oral contact (STI)

Question 19

Taxoplasma gondii

Answer 19

Congenital transmission
Ingestion of oocyts in raw pork
Inhalation of oocysts from cat
feces

Question 20

Giardia lamblia

Answer 20

Fecal-oral:
Ingestion of
mature
Cyst

Question 21

Trichomonas vaginalis

Answer 21

Contact-transmitted: Sexual
intercourse