Final answer:
Toxoplasmosis is a parasitic infection caused by Toxoplasma gondii and is a common opportunistic infection in individuals with compromised immune systems, including those with HIV or AIDS.
Step-by-step explanation:
The parasitic infection often acquired after eating undercooked meat and frequently seen as an opportunistic infection in individuals with HIV is toxoplasmosis. Toxoplasmosis is caused by the protozoan Toxoplasma gondii. People with compromised immune systems, such as those with acquired immunodeficiency syndrome (AIDS), which can develop from the human immunodeficiency virus (HIV), are more susceptible to this infection. When humans eat undercooked meat containing tissue cysts of the parasite, they can contract the disease. This can lead to serious health issues, especially for those with an already weakened immune system. The infection is typically mild or symptomless in individuals with a healthy immune system but can cause significant complications for those with compromised immunity.