38 THE UNIVERSITY OF OKLAHOMA 



sent in Oklahoma, but since so little is known of this group in this 

 locality we cannot take it up farther here. 



Other protozoa attacking man are Giardia (Lamblia) intestinalis 

 and species of Trichomonas, causing severe irritations and inflam- 

 mations of the intestine. Bdlantidiiim coli is a cilate protozoan 

 which causes a severe type of dysentery in man and sometimes in 

 hogs. This form is very common in hogs in some localities and it is 

 undoubtedly more common in man than most of us realize. 



Among the most common protozoa living in the blood we have 

 Flasniodium vialariac and Piroplasma bigcmina with which the 

 must of us are more or less familiar. The P. malariae is the 

 causative organism of malaria and is common in certain parts of 

 this, state where the Anopheles mosquito is present to transmit it 

 from one person to another. There is also a malarial parasite com- 

 mon in certain birds but it is not pathogenic for man. Piroplasma 

 bigcmina is the causative factor in Texas-fever in cattle and is 

 transmitted by the bite of the Texas-fever tick. Other species of 

 blood protozoa are present without doubt but the writer has no 

 available record of their occurance. There are some species of 

 coccidia which attack cattle, dogs and poultry, producing several 

 types of coccidiosis, of which the entero-hepatitis or "black-head" 

 of turkeys, and coccidial enteritis of young chicks deserve special 

 mention. 



Trematodes (Flukes) 



The writer is not aware of any records of trematodes occurring 

 in man in Oklahoma, however, Faseiola hepatic and F. magna, 

 liver flukes of sheep and cattle have been reported. These cause 

 the disease known as liver-rot, or "leech-liver," and have been re- 

 ported from man many times in other countries. No records are 

 available for any other trematodes occurring in our domestic ani- 

 mals. Water-birds, frogs and fishes harbour several species of 

 trematodes. Some of these are of considerable economic importance. 



Cestodes (Tapeworms) 



Tapeworms are generally common in nearly all species of ani- 

 mals in this state. From man we have Taenia saginata, the 

 common beef tapeworm, and T. sdliiim, the pork worm. Both 

 species occur only occasionally, the former being more common 

 than the latter. This is undoubtedly due to the fact that more 

 raw beef is consumed than raw pork.. Recently the writer has 

 found Cysticcrci cellulosae, the bladder worm stage of T. solium, 

 tn pork from several localities of the state. Dipylidium caninum, 

 a common dog tapeworm, has been reported from children a great 

 many times in recent years. The writer has no record of its occur- 



