Final answer:
The symptoms described, including pale mucous membranes, anemia, bloody diarrhea, and weakness, are indicative of a parasitic infection called Giardiasis.
Step-by-step explanation:
The symptoms described, including pale mucous membranes, anemia, bloody diarrhea, and weakness, are indicative of a parasitic infection called Giardiasis. Giardiasis is caused by the protozoan parasite Giardia lamblia. The infection is commonly transmitted through contaminated water and food, and it can cause severe diarrhea in affected individuals.