CHAPTER XXV
TABLE OF IMPORTANT ANIMAL PARASITE DISEASES
Protozoal Diseases
| Parasite | Defin. host | Intermediate host | Important reservoir of virus | Transmission and pathogenicity |
| Entamoeba histolytica. | Man. | Not required. | Man-carrier stage (feces). | Cysts in food or water. Flies may act as carriers. Ingestive. Amoebic dysentery. |
| Balantidium coli. | Man (hogs). | Not required. | Man-carrier stage (hogs). | Transmission probably same as for E. histolytica. Found in those having care of hogs. Ingestive. Balantidium dysentery. Anaemia. |
| Lamblia (Giardia) intestinalis. | Man (mice and rats). | Not required. | Man-carrier stage (mice and rats). | Transmission probably same as for E. histolytica. Rat feces on human food important. Ingestive. Lamblia dysentery. Giardiasis. |
| Spiroschaudinnia (Spironema) recurrentis, carteri, etc. (louse group.) | Louse (P. vestimenti). | Man.(*) | Man (blood). | Cyclical development in louse. Bite puncture contaminated by crushed louse. Relapsing fever. |
| Spiroschaudinnia (Spironema) duttoni, novyi. (Tick group.) | Tick (species of Ornithdorus or Argas). | Man.(*) | Man (blood). | Excretions of tick contaminating tick-bite. Tick fevers. Relapsing fever. |
| Treponema (pallidum and pertenue). | Man. | Not required. | Man. | T. pallidum. Usually venereal. Syphilis. T. pertenue. Flies or contact. Yaws. |
| Leptospira icterohaemorrhagiae. | Man (rat). | Not required. | Rat. | Common infection of rats. Present in blood. Excreted in urine. Ingestion. Weil’s disease. |
| Leptospira icteroides. | Mosquito (Stegomyia calopus) | Man. | Man (blood). | Cyclical development in mosquito—12 days. Inoculative. Yellow fever. |
Protozoal Diseases (Continued)
| Parasite | Defin. host | Intermediate host | Important reservoir of virus | Transmission and pathogenicity |
| Leptospira morsus-muris. | Man (rat). | Not required. | Rat. | Man inoculated by bite of infected rat. Rat bite fever. |
| Trypanosoma gambiense and rhodesiense. | Fly (Glossina species) | Man. | Man—game animals? (blood). | Cyclical development in tsetse fly. Inoculative. Sleeping sickness. |
| Schizotrypanum cruzi. | Lamus megistus | Man. | Man. | Cyclical development in bug. Inoculative. Brazilian trypanosomiasis. |
| Leishmania (donovani, infantum, and tropica). | Not surely known. | Man. | Man. | L. donovani—Bed bug? kala-azar. L. infantum—dog flea? infantile leishmaniasis. L. tropicum—biting insects? Oriental sore; American leishmaniasis. |
| Plasmodium malariae, vivax and falciparum. | Mosquito (Anopheline species) | Man (with schizonts). | Man (blood) (with gametes). | Cyclical development in mosquito—12 days. Inoculative. Malaria. |
| Rickettsia prowazeki. | Man. | Louse (P. vestimenti). | Man (blood) | Cyclical development in louse. Bite puncture inoculated by louse feces. Typhus fever. |
| Dermacentroxenus rickettsi. | Man (goats, rodents, etc.). | Tick (Dermacentor andersoni). D. venustus. | Goats and rodents. | Excretions of tick contaminating tick-bite. Rocky Mountain fever. |
| Bartonella bacilliformis. | Man. | Unknown. | Man (blood) | Transmission unknown. Species of Phlebotomus suggested. Oroya fever. |
Note.—(*) Some authorities give man as definitive host of Spiroschaudinnia (Spironema). Diseases often classified as filterable virus ones of protozoal affinity are (1) Dengue. Cause unknown. Transmitted by Stegomyia species. (2) Pappataci fever. Cause unknown. Transmitted by Phlebotomus species. Other protozoal diseases are (1) Tsutsugamushi. Probably a protozoan. Transmitted by Kedani mite. (2) Trench fever. Probably Rickettsia. Transmitted by louse.