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Background   Giardia  and  Cryptosporidium  are the most common causes of protozoan diarrhea that lead to significant morbidity and mortality worldwide. The purpose of this study was to determine the prevalence of  Giardia duodenalis  and  Cryptosporidium  species infections among children and cattle, and to assess the potential risk of zoonotic transmission.    Methods  This cross-sectional study was conducted between January and April 2009 in Girar Jarso and Dera Districts of North Shewa Zone, Oromia Region, Ethiopia. A total of 768 stool specimens were collected and examined for intestinal parasites using direct wet mount with saline and formalin ether concentration methods. The modified Ziehl-Neelsen staining method was used for the detection of  Cryptosporidium  species. Statistical analysis was performed using SPSS software version 15.    Results  Out of 384 children examined, 53 (13.8%) and 28 (7.3%) were positive for  Giardia  and  Cryptosporidium  infections, respectively. Similarly, of the total 384 cattle examined, 9 (2.3%) were positive for  Giardia duodenalis  and 30 (7.8%) were positive for  Cryptosporidium  infection. The prevalence of giardiasis was significantly higher among children who had close contact with cattle 33 (18.7%) compared to children who had no contact with cattle 20 (9.6%) (P < 0.05). Higher number of  Cryptosporidium  infection was also recorded in children who had close contact with cattle 15 (8.5%). Difference in prevalence of giardiasis and cryptosporidiosis among children was not statistically significant between males and females. On the other hand, difference in the prevalence of giardiasis among children was statistically significant between age groups.    Conclusions  Higher prevalence of  Giardia duodenalis  infection detected among children was significantly associated with contact with cattle and manure that the children had. Further analysis using molecular techniques is needed to explain the existence of zoonotic transmission in the study area.

Prevalence of Giardia duodenalis and Cryptosporidium species infections among children and cattle in North Shewa Zone, Ethiopia