30 Questions
What is the primary reason for studying parasitology?
To address the major public health problems caused by parasites
What is the estimated number of people affected by lymphatic filariasis, ascariasis, and hookworms?
1.5 billion, 1.3 billion, and 1 billion respectively
What is a common way that parasites are brought into the country?
Through immigrants who bring their parasites with them
What is the definition of a parasite?
A living organism that acquires its basic requirements and derives all benefits through intimate contact with another organism
What is the term for the organism that harbors the parasite?
Host
Why is there a low understanding of parasitic infections in the country?
Due to lack of education and awareness
What is the host in which the adult stage of a parasite lives and where the sexual mode of reproduction takes place?
Definitive host
Which type of host undergoes some development or asexual reproduction, but not sexual maturity?
Intermediate host
What is the term for a host that passes on the infection to another host?
Transport host
What is the term for a vertebrate host in which a parasite merely remains viable without development or multiplication?
Paratenic host
Which parasite has humans as its paratenic host?
Toxocara cati
What is the term for the stage of the parasite that migrates through the viscera of the host?
Visceral larva migrans
Which structure can be used to differentiate macrophages from amoebic trophozoites?
Nucleus
What can be added to a wet preparation to stain the internal structure of a protozoan cyst?
Iodine
Which of the following can be confused with helminth eggs in stool?
Pollen grains
What can be used to differentiate trophozoites of Entamoeba histolytica/dispar from white blood cells and macrophages?
Motility
What can be mistaken for the larvae of hookworm or Strongyloides stercoralis in stool?
Plant hairs
Why are macrophages only motile for a very short time?
Due to their large nucleus
What can be confused with helminth larvae in a stool sample?
Plant cell
What is the characteristic of starch granules in an undigested state?
They stain blue with iodine
What can be mistaken for the oocysts of Cryptosporidium and Cyclospora in acid-fast stained stool specimens?
Fungal elements
What is the definition of pathogenesis?
The cause and development of a disease, especially within cells
What are Charcot-Leyden crystals composed of?
Eosinophil cells
What is the characteristic of starch granules in a partially digested state?
They stain red with iodine
What is the mode of transmission of parasites from mother to fetus?
Through congenital transmission via placenta
What is an autogenous infection?
An infection acquired from oneself
What is a carrier of a disease?
A person who has the disease but shows no symptoms
What is an example of natural immunity?
When a host has a physiological incompatibility with a parasite
How do flies transmit parasites?
By laying eggs on wounds
What is an example of an inanimate source of infection?
Soil
Learn about the importance of studying parasitology, including the prevalence of parasites that cause major public health problems, such as lymphatic filariasis, ascariasis, and malaria.
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