## **Core Concept**
The question revolves around the common causes of graft infection following a renal transplant, particularly within the first two months post-transplant. This period is crucial as the patient is on immunosuppressive therapy, making them susceptible to various infections. The type of infection is often related to the timing post-transplant and the level of immunosuppression.

## **Why the Correct Answer is Right**
The correct answer, **C. CMV (Cytomegalovirus)**, is the most probable cause of graft infection within 2 months post-renal transplant. CMV is a common cause of viral infections in immunocompromised patients, especially those who have undergone organ transplantation. It can cause a range of diseases, from mild to severe, including pneumonia, gastrointestinal disease, and retinitis. In the context of a renal transplant, CMV infection can directly affect the graft, leading to dysfunction. Early post-transplant infections, especially within the first two months, are often due to reactivation of latent viruses like CMV or due to primary infection if the donor organ is CMV-positive and the recipient is CMV-negative.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While bacterial infections are a significant concern post-transplant, they are more commonly associated with wound infections or urinary tract infections rather than direct graft infection within the first two months.
- **Option B:** Fungal infections can occur post-transplant but are less common causes of graft infection in the early period compared to viral infections like CMV.
- **Option D:** EBV (Epstein-Barr Virus) can cause infections post-transplant, notably post-transplant lymphoproliferative disorder (PTLD), but it is less commonly associated with graft infection in the early period compared to CMV.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that CMV infection is a significant risk in the early period following organ transplantation, particularly within the first 3-6 months. Prophylactic measures, including antiviral medications, are often used to prevent CMV disease in high-risk transplant recipients.

## **Correct Answer:** C. CMV (Cytomegalovirus)