Final answer:
Patients with immunodeficiency, such as Severe Combined Immunodeficiency (SCID) or HIV/AIDS, are at risk due to the function of T-cells. Without functioning T-cells, the patient's immune system becomes impaired, leaving them susceptible to opportunistic infections. In patients with genetic disorders that affect T-cell production, their B-cells may also be unable to produce antibodies.
Step-by-step explanation:
The type of patient that is at risk due to the function of T-cells is a patient with immunodeficiency, such as Severe Combined Immunodeficiency (SCID) or HIV/AIDS. In these conditions, there is a decline in the number of CD4 helper T-cells, which results in immunodeficiency and makes the patient susceptible to opportunistic infections.
In the case of a patient lacking the ability to make functioning T-cells due to a genetic disorder, their B-cells would also be affected. Without T-cells, the B-cells cannot receive the necessary signals to produce antibodies in response to an infection.