In this research a case- control study will be used) ,the percentage of case to control will be 1:1 the total number of samples 192 ,investigators will take stool and blood samples from two groups of humans :-~1-group A (healthy group negative Giardia or control group),2-group B (positive Giardia or case group)then investigators make estimation for vitamin D in both groups then investigators try to find if there is relation between vitamin D level and Giardia lamblia infections
investigators will take stool and blood samples from two groups of humans :-~1-group A (healthy group negative Giardia or control group),2-group B (positive Giardia or case group)then investigators make estimation for vitamin D in both groups then investigators try to find if there is relation between vitamin D level and Giardia lamblia infections