Para Lab 4

PARASITOLOGY LABORATORY 4 - Trematodes USTMED ’07 Sec C – AsM; Photos provided by JV.N. SCHISTOSOMA JAPONICUM

Schistosomiasis: Spleen

Schistosoma japonicum ova in human brain

Schistosoma japonicum ova in intestine

Schistosoma japonicum female

Schistosoma japonicum ova in liver

Schistosomiasis Appendix Schistosoma japonicum male

Schistosoma japonicum in copula: adult schistosomes live in pairs in the portal system and in mesenteric venules; adults of S.japonicum are bigger than adults of S.mansoni. Males are 12-20 mm in length and 0.5 mm wide, and have a ventral infolding from the ventral sucker to the posterior end forming the gynecophoric canal. Adult male with female in the copulatory groove.

male

female

S. japonicum: females are slender (0.3 mm in diameter) and longer (up to 26 mm in length), and are held in the gynecophoric canal during copulation. Each female may lay up to 2000-3000 eggs per day.

Schistosoma japonicum copula w.m.

S. Japonicum: Males are 12-20 mm in length and 0.5 wide, and have a ventral infolding from the ventral sucker to the posterior end forming the gynecophoric canal.

Schistosoma japonicum, cercaria

SCHISTOSOMA MANSONI

The cercaria emerge and penetrate the skins of humans who are in direct contact with snail-infested water.

Schistosoma mansoni, male and female adults, carmine stain. The schistosomes are the only human trematodes with separate sexes. The long slender female lies within the gynecophoral canal of the more robus male. Several small testes in the anterior portion of the male worm may be seen. These flukes live in blood vessels of the human host, as do all the other schistosomes. Schistosoma mansoni

Schistosoma japonicum (feces; eggs 75-95 x 45-65 micrometers) Lateral knob

Schistosoma japonicum cercariae.

Schistosoma spp.: cercarae are the infective forms. They measure about 500 micron. After encountering the skin, the cercariae penetrate and lose the tail transforming into schistosomulae. Observe the tail of the cercaria that is why they are known as forked tailed cercaria (arrow).

Schistosoma mansoni (feces; eggs 115-175 x 45-70 micrometers) Lateral Spine

Schistosoma japonicum ova

1

Schistosoma haematobium

2

The S. japonicum egg is smaller than those of S.mansoni and S. haematobium. It is ovoid and has a thin, clear shell and a small spine or hook on its lateral margin that may be inconspicuous and difficult to see (Fig 1). This egg, like the other schistosome eggs, contains a miracidium when passed in feces. The eggs of this species frequently have fecal debris adhering to their surface, making their surface, making identification more difficult.

Schistosoma japonicum (feces; eggs Embryonated ova with lateral knob

75-95

x

45-65

(urine; eggs 115-170 x 45-65 micrometers) Terminal spine

micrometers)

thanks everyone for making PaJam successful! We, C3 and friends of Pam, owe everyone our utmost gratitude. We hope we could rely on your support and generosity again in the future to make this time for Pam easier if only for a little bit… thanks again everyone! Special mention to: Pipo for lending us his rooftop for the venue (thanks sir Pipo!), Oncomelania quadrasi snail

thanks to Section C for your time and generosity especially to everyone who came and bought food and drinks, (kahit na medyo expensive!), thanks to Sections A,B and D for reaching out to help a fellow batchmate and for lending their talents for the night (you guys are so talented!). Pray4Pam -Subsec 2C3-

Oncomelania formosana snail

[email protected] [email protected]