Medical Microbiology

548 10 Helminths

Table 1 0. 2 SchistosomaSpeciesthatCommonlyInfectHumans^1

Schistosoma

speciesand

length(mm)

Mainlocationof

adultstages^2

Eggs:characteristics,

dimensions,and

excretion(E)

I:Intermediate

hosts(snails),

R:Animalreser-

voirhosts^3

S.haematobium

FF:7–1 5

ff:9–2 0

Venousplexus

inminorpelvis

(drainingurinary

bladder,etc.)

Ovoid,withterminal

spine,

83 – 187! 60 – 70 lm

E:urine,rarelystool

I:Bulinusspecies

R:(Monkeys)

S.intercalatum

FF: 1 1–1 4

ff: 1 3–2 4

Mesentericveins

(drainingcolon)

Ovoid,withterminal

spine,

140 –24 0! 50 – 85 lm

E:stool^3

I:Bulinusspecies

R:(sheep,goats)

S.mansoni

FF:6–1 0

ff:7–1 5

Mesentericveins

(drainingcolon)

Ovoid,withlateralspine,

11 2–1 75! 45 – 70 lm

E:stool

I:Biomphalaria

species.

R:(monkeys,dog,

rodents)

S.japonicum

FF:7–2 0

ff: 1 0 – 26

Mesentericveins

(drainingintestine)

Elliptical,lateralspine

tinyorlacking

70 – 100! 50 – 65 lm

E:stool

I:Oncomelania

species.

R:Cattle,buffalo,

pig,dog,rodents,

etc.

S.mekongi

FF:10– 18

ff: 1 4–2 0

Mesentericveins

(drainingsmall

intestine)

Elliptical,lateralspine

tinyorlacking

50 – 65! 30 – 55 lm

E:stool

I:Neotricula

species.

R:dog

(^1) Locationnotstrictlyspecific;adultstagesalsofoundinvesselsofliver,lungs,and,
lessfrequently,inotherorgans.
(^2) Inparentheses:ofsecondaryorlocalsignificanceonly.
(^103) StainablewithZiehl-Neelsenstain,incontrasttoS.hematobium.
Kayser, Medical Microbiology © 2005 Thieme