Review Question - QID 109968

A 37-year-old man makes an appointment with his primary care physician because he has been feeling tired and is no longer able to play on a recreational soccer team. He also says his coworkers have commented that he appears pale though he has not noticed any changes himself. He says that he has been generally healthy and that the only notable event that happened in the last year is that he went backpacking all over the world. Based on clinical suspicion, a series of blood tests are performed with partial results presented below:

Hemoglobin: 9.8 g/dL
Platelet count: 174,000/mm^3
Mean corpuscular volume: 72 µm^3 (normal: 80-100 µm^3)
Iron: 22 µg/dL (normal: 50-170 µg/dL)
Ferritin: 8 ng/mL (normal: 15-200 ng/mL)
Lactate dehydrogenase: 57 U/L (normal: 45-90 U/L)
Urine hemoglobin: absent

Infection with which of the following types of organisms could lead to this pattern of findings?