Final answer:
The possible parasite causing the intermittent fever and enlarged infected RBC in the 12-year-old student is Plasmodium vivax.
Step-by-step explanation:
The symptoms described, including intermittent fever and the presence of enlarged infected red blood cells (RBCs) in a 12-year-old's blood smear stained with Giemsa, suggest a potential infection with Plasmodium vivax, a malaria-causing parasite. Plasmodium vivax is known to cause a type of malaria that often exhibits a relapsing or intermittent fever pattern.
The enlargement of infected RBCs, known as schizonts, is characteristic of Plasmodium vivax infection. Malaria is a vector-borne disease transmitted through the bite of infected female Anopheles mosquitoes carrying the Plasmodium parasite. Diagnosis is confirmed through blood smears, and prompt treatment is essential to manage the infection and prevent complications. It is crucial for the individual to seek medical attention for a thorough evaluation and appropriate antimalarial treatment.