True about toxoplasmosis is all except –
**Core Concept**
Toxoplasmosis is a parasitic infection caused by *Toxoplasma gondii*, which is a protozoan that affects humans and other warm-blooded animals. This infection can be acquired through contaminated food, water, or contact with infected cats.
**Why the Correct Answer is Right**
The correct answer will be the statement that is true about toxoplasmosis. The parasite invades and multiplies within the cells of the host, where it can evade the immune response by forming a cyst that contains bradyzoites. This cyst can remain dormant for years and reactivate if the host's immune system is compromised.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because toxoplasmosis is not transmitted through the air. The parasite is usually acquired through contaminated food, water, or contact with infected cats, which can shed oocysts in their feces.
* **Option B:** This option is incorrect because toxoplasmosis is not caused by a virus. It is a parasitic infection caused by the protozoan *Toxoplasma gondii*.
* **Option C:** This option is incorrect because toxoplasmosis is not typically transmitted from mother to fetus during pregnancy. However, if the mother becomes infected for the first time during pregnancy, the risk of transmission to the fetus is higher.
**Clinical Pearl / High-Yield Fact**
Toxoplasmosis can be prevented by avoiding contact with contaminated cat feces, cooking meat thoroughly, and avoiding unpasteurized dairy products.
**Correct Answer:** A.