. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. COCCIDIANS 171 host cell which has been preyed upon and destroyed, invade fresh cells, multiply again, and thus eventually destroy large portions of the lining of the digestive tract. The daughter coccidians are not adapted for withstanding conditions outside the intestine. Fig. 48. Life history of Eimeria avium. A, infection of epithelial cells of in- testine'by sporozoites ingested with food or water; B, growth inside cell; C and D, sporulation and formation of young spores; E and G, formation of fema
. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. COCCIDIANS 171 host cell which has been preyed upon and destroyed, invade fresh cells, multiply again, and thus eventually destroy large portions of the lining of the digestive tract. The daughter coccidians are not adapted for withstanding conditions outside the intestine. Fig. 48. Life history of Eimeria avium. A, infection of epithelial cells of in- testine'by sporozoites ingested with food or water; B, growth inside cell; C and D, sporulation and formation of young spores; E and G, formation of female gamete; F and H, formation of male gametes; /, fertilization; /, fully developed oocyst as passed out with faeces; K, L and M, formation of four sporocysts; N, complete development of sporocysts, each containing two sporozoites; 0, same, ingested by susceptible animal; P, sporocyst liberated from oocyst in alimentary canal; Q, liberated sporozoite ready to infect epithelial cell, as shown in A. of the host, and therefore the parasite would be exterminated with the death of its host were it not protected in some manner against this calamity. The sexual phase of its life history serves. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Chandler, Asa Crawford, 1891-. New York, J. Wiley
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