Which of the following statements is true about toxoplasmosis?
Toxoplasmosis is caused by Toxoplasma gondii, a protozoan parasite. The core concept here is understanding its transmission, clinical manifestations, and risk factors. The question is likely testing knowledge on when it's most dangerous, especially in immunocompromised individuals or pregnant women.
The correct answer might relate to congenital transmission if the mother is infected during pregnancy. Alternatively, it could be about the reactivation in immunocompromised patients, like those with HIV. Let me think about the options. Since the options aren't provided, I'll have to infer based on common exam questions.
Common true statements include that it's transmitted via undercooked meat, cat feces, or transplacentally. Ocular toxoplasmosis can occur in congenital cases. In immunocompromised patients, treatment with pyrimethamine and sulfadiazine is typical. Also, IgG antibodies can indicate past infection, important in pregnancy.
Now, the wrong options might be things like transmission through dogs (incorrect, it's cats), treatment with penicillin (wrong, uses pyrimethamine), or that it's not a concern in pregnancy (actually, it is a concern).
The clinical pearl here is that congenital toxoplasmosis can lead to chorioretinitis, hydrocephalus, and other issues, so prenatal screening is crucial. Also, in HIV patients, Toxoplasma encephalitis is a common complication when CD4 counts are very low.
Putting this together, the correct answer is likely about congenital transmission if the mother is infected during pregnancy. The explanation should highlight the importance of maternal infection timing and the risks to the fetus.
**Core Concept**
Toxoplasmosis, caused by *Toxoplasma gondii*, is a protozoan infection with significant clinical implications in immunocompromised individuals and during pregnancy. Congenital transmission occurs if a pregnant woman acquires the infection, leading to severe fetal complications.
**Why the Correct Answer is Right**
The correct statement is likely about **congenital toxoplasmosis**. If a woman contracts *T. gondii* during pregnancy, the parasite can cross the placenta, causing fetal abnormalities such as chorioretinitis, hydrocephalus, or intracranial calcifications. Primary infection in the first trimester carries higher fetal risk, while later infections may cause milder ocular disease. Diagnosis relies on detecting IgM antibodies in the mother, and treatment with spiramycin (pregnancy) or pyrimethamine/sulfadiazine (postnatally) aims to reduce fetal transmission.
**Why Each Wrong Option is Incorrect**
**Option A:** Claims transmission occurs via dog feces—incorrect, as *T. gondii* oocysts are shed only in cat feces.
**Option B:** Suggests penicillin is the treatment—wrong; penicillin is ineffective against protozoa; pyrimethamine and sulfadiazine are standard.
**Option C:** States it causes encephalitis in