Eimeria tenella and Eimeria tenella

1)                     Intracellular sporozoite (chicken kidney cells).

                                                            Indentation of host cell nucleus

                                                            Vacuole surrounds the parasite

 2)                     Development of sporozoite into trophozoite

                              Nucleus anterior to refractile globule

 3)                     Multinucleated schizonts

 4)                     1^st generation schizonts (immature)

 5)                     Mature 1^st generation schizont

 6)                     1^st generation merozoits (long ones)

                        2^nd generation trophozoites (round ones)

 7)                     Immature 2^nd generation schizonts

                                    Note multiple infections of single cells

8)                     2^nd  generation schizonts

                                    Merozoites 2x as large as those of 1^st generation

 9)                     Free 2^nd generation merozoites

 10)                Immature micro (male) and macrogametocyte (female)

 11)                male and female gametocyte

 12)                Mature microgametocyte (male)

 13)                Mature macrogametocyte (female)

                                     Karyosome clearly visible

14)       Immature oocyst

Schistosoma, Schistosome eggs

Schistosoma haematobium

15)                   Egg (terminal spined)

Schistosome japonicum

16-18)  Egg (Lateral spine visible)

Schistosome mansoni

                                    Schistosome mansoni

19)                   Egg

20)                   Egg

21)                   Egg

22)                   Cercaria penetrating the skin

23)                   Cercaria

24)                   SEM of cercaria penetrating the skin

25)                  Young schistosomule

26)                   S. japonicum – paired adult male and female

Schistosome Distribution