Helminths

Question 1

a symbiotic relationship that is of benefit to one party or symbiont

Answer 1

Parasitism

Question 2

Parasites that live outside
the host’s body are referred to as

Answer 2

ectoparasites

Question 3

Parasites that live INSIDE
the host’s body are referred to
as

Answer 3

endoparasites

Question 4

If more than one
host is involved, the ______ is the one that harbors the adult or sexual stage of the parasite or the sexual phase of the life cycle.

Answer 4

definitive
host

Question 5

harbors the larval or asexual stage of the parasite or the
asexual phase of the life cycle

Answer 5

intermediate
host

Question 6

is a living organism that can serve as a host in a particular parasite’s life cycle, but is not a
usual host in that life cycle.

Answer 6

accidental host

Question 7

A parasite THAT cannot continue its life cycle.

Answer 7

Dead-end hosts

Question 8

is an organism that can be parasitic but does not have to live as a parasite

Answer 8

facultative parasite

Question 9

on the other hand, has no
choice; to survive, it must be a parasite

Answer 9

obligate parasite

Question 10

is the study of parasites
that cause human disease

Answer 10

Medical parasitology

Question 11

these microbes are classified
taxonomically by their
mode of locomotion.

Answer 11

Protozoa

Question 12

Amebas
(amebae) move by means

Answer 12

pseudopodia

Question 13

Protozoa classified as ______ have no pseudopodia, flagella, or cilia, and therefore exhibit
no motility.

Answer 13

Sporozoa (sporozoans)

Question 14

is caused by various species of
flagellated protozoa
and is usually
transmitted via the
bite of an infected
sand fly

Answer 14

Leishmaniasis

Question 15

three forms of leishmaniasis

Answer 15

cutaneous,
mucocutaneous (or mucosal), visceral

Question 16

this form of leishmaniasis starts with a papule that enlarges into
a craterlike ulcer

Answer 16

cutaneous

Question 17

this leishmaniasis is characterized by fever, enlarged liver and spleen, lymphadenopathy, anemia, leukopenia, and progressive emaciation and
weakness

Answer 17

Visceral leishmaniasis, also known as kala-azar,

Question 18

this type of protozoa is principally a zoonosis and
is usually transmitted via the bite of an infected sand fly.

Transmission by blood transfusion and person-to-person contact have been reported

Answer 18

Leishmaniasis

Question 19

Protozoal infections of the eyes include

Answer 19

conjunctivitis and
keratoconjunctivitis

Question 20

is a systemic sporozoan infection that, in immunocompetent persons, may be asymptomatic or resemble infectious
mononucleosis

Answer 20

Toxoplasmosis

Question 21

a protozoal gastrointestinal infection that may be
asymptomatic, mild, or severe accompanied by dysentery, fever, chills, bloody or mucoid diarrhea or constipation,

Answer 21

Amebiasis

Question 22

a protozoal gastrointestinal infection of the colon causing
diarrhea or dysentery, colic, nausea, and vomiting.

Answer 22

Balantidiasis

Question 23

is a gastrointestinal infection caused by a coccidial
protozoan

Answer 23

Cryptosporidiosis.

Question 24

s a protozoal infection of the
duodenum

Answer 24

Giardiasis

Question 25

Protozoal Infections of the Genitourinary Tract

Answer 25

Trichomoniasis

Question 26

a sexually transmitted protozoal disease affecting both men and women. is usually symptomatic in women, causing vaginitis

Answer 26

Trichomoniasis

Question 27

Infects colon with secondary infection of liver. patients pass noninfectious trophozoites as well as infectious cysts in stools

Answer 27

Entamoeba histolytica

Question 28

Infects lower small intestine. * Diagnosis by modified acid-fast stain of stool sample ;oocyst

Answer 28

Cryptosporidium parvum

Question 29

*Infection usually results from drinking contaminated water. Acute infection shows sudden onset with foul smelling, watery diarrhea.

Answer 29

Giardia lamblia

Question 30

a systemic disease caused by flagellated protozoa in the bloodstream, known as hemoflagellates.

Answer 30

African Trypanosomiasi

Question 31

The frequency with which the cycle of chills, fever, and sweating is repeated is referred to as periodicity what protozoal infection is this

Answer 31

Malaria

Question 32

means parasitic worm.

Answer 32

helminth

Question 33

The helminths that infect humans are always

Answer 33

endoparasites

Question 34

The two major divisions of helminths

Answer 34

roundworms (nematodes) flatworms

Question 35

The flatworms are further divided into

Answer 35

tapeworms (cestodes) flukes (trematodes)

Question 36

The stages of the typical helminth life cycle are the

Answer 36

egg, the larva adult worm.

Question 37

The host that harbors the larval stage is called the

Answer 37

intermediate host

Question 38

host that harbors the adult worm is called the

Answer 38

definitive host

Question 39

(also known as “river blindness”)

Answer 39

Onchocerciasis

Question 40

3 classes of artbropods

Answer 40

insects (class Insecta), arachnids (class Arachnida), crustaceans

Question 41

an arthropod in whose body the pathogen multiplies or matures (or both).

Answer 41

biologic vector

Question 42

1. Humans develop malaria after the injection of Plasmodium __________ into the bloodstream by an infected female Anopheles mosquito when she takes a blood meal. a. male and female gametocytes b. schizonts c. sporozoites d. trophozoites

Answer 42

c

Question 43

These Plasmodium life cycle stages must be ingested by a female Anopheles mosquito for the Plasmodium life cycle to continue in the mosquito. a. male and female gametocytes b. schizonts c. sporozoites d. trophozoites

Answer 43

a

Question 44

Which of the following protozoal diseases is not transmitted via an arthropod vector? a. African trypanosomiasis b. American trypanosomiasis c. babesiosis d. giardiasis

Answer 44

d

Question 45

. Which of the following protozoal diseases is least likely to be transmitted via blood transfusion? a. American trypanosomiasis b. babesiosis c. malaria d. trichomoniasis

Answer 45

d

Question 46

Which of the following protozoal diseases is least likely to be transmitted via an infected food handler who fails to wash his or her hands after using the bathroom? a. amebiasis b. cryptosporidiosis c. giardiasis d. toxoplasmosis

Answer 46

d

Question 47

You are visiting a friend whose parents raise pigs. Which of the following diseases are you most likely to acquire by drinking well water at their farm? a. amebiasis b. balantidiasis c. cryptosporidiosis

Answer 47

b

Question 48

You are working on a cattle ranch. Which of the following diseases are you most apt to acquire as you perform your duties at the ranch? a. amebiasis b. balantidiasis c. cryptosporidiosis d. giardiasis

Answer 48

c

Question 49

. Which of the following protozoal diseases are you most likely to acquire by eating a rare hamburger? a. amebiasis b. balantidiasis c. giardiasis d. toxoplasmosis

Answer 49

d

Question 50

Which of the following associations is incorrect? a. African trypanosomiasis . . . tsetse fly b. amebiasis . . . fecally contaminated water c. Chagas’ disease . . . mosquito d. toxoplasmosis . . . cats

Answer 50

c

Question 51

Which of the following is an example of an infectious disease that is caused by a facultative parasite? a. African trypanosomiasis b. giardiasis c. malaria d. PAM

Answer 51

d