IV. Read the passage below and fill in the blanks with the words from the box
severe
blindness
defects
inflammation
disorder
mild
pathogens
attention
revealed
sporozoa
transfusion
contracted
mouth
organ
infected
percentage
causes
liver
pregnancy
Human (1)______ appear in all groups of protozoa, but zooflagellates and (2)______ cause the most (3)______ diseases. Toxoplasma gondii is a protozoan that (4)______ toxoplasmosis, with symptoms so (5)______ (fatigue) that many otherwise healthy people are (6)______ and never know it. The infection came to public (7)______ when physicians traced fetal (8)______ to pregnant women who (9)______ toxoplasmosis from cat feces in litter boxes. Symptoms in the fetus include an enlarged (10)______ and spleen, a rash, eye inflammation causing (11)______, and brain damage. The women had no symptoms when pregnant — only an immune system test (12)______ the infection. The maternal infection must occur early in (13)______ to affect the fetus, and only a small (14)______ of exposed fetuses actually develop symptoms.
People also may contract toxoplasmosis from eating raw or undercooked meat, undergoing an (15)______ transplant, or receiving a blood (16)______. An infected person takes in cysts through the nose or (17)______.
In people with AIDS, toxoplasmosis is not a vague, mild (18)______, but a deadly disease. The protozoa quickly spread to the brain, causing (19)______ (encephalitis), and also travel to the lungs, heart, liver, and eyes.