Final answer:
PCR assay for T. gondii can be performed on serum or plasma, fresh or frozen biopsy tissue, and cerebrospinal tissue.
Step-by-step explanation:
PCR assay for T. gondii can be performed on serum or plasma, fresh or frozen biopsy tissue, and cerebrospinal tissue. PCR, or polymerase chain reaction, is a molecular technique used to amplify specific DNA sequences. In the case of T. gondii, PCR can be used to detect its presence in different biological samples.