While performing a procedure, a resident doctor injures herself with a suture needle that has been used to stitch a patient with HIV infection for 11 years. He has been complaint with therapy for several years and has recently changed tablets because of alteration in his appearance. His last CD4 count was 360 cells/mm. The doctor is offered post exposure prophylaxis. Which regimen should she take?
While performing a procedure, a resident doctor injures herself with a suture needle that has been used to stitch a patient with HIV infection for 11 years. He has been complaint with therapy for several years and has recently changed tablets because of alteration in his appearance. His last CD4 count was 360 cells/mm. The doctor is offered post exposure prophylaxis. Which regimen should she take?
💡 Explanation
**Core Concept**
The underlying principle being tested is the management of occupational exposure to HIV, specifically the use of post-exposure prophylaxis (PEP) to prevent seroconversion. This involves understanding the **HIV life cycle** and the role of **antiretroviral therapy** in preventing viral replication.
**Why the Correct Answer is Right**
The correct regimen for PEP typically involves a combination of **antiretroviral drugs**, such as tenofovir disoproxil fumarate (TDF) and emtricitabine (FTC), with or without a third agent like raltegravir (RAL) or dolutegravir (DTG), depending on the severity of the exposure and the source patient's viral load and resistance profile. The choice of regimen is guided by the **US Public Health Service guidelines** and takes into account factors like the **CD4 count** of the source patient.
**Why Each Wrong Option is Incorrect**
**Option A:** May not provide adequate coverage against potential HIV strains.
**Option B:** Insufficient information is provided to determine its correctness.
**Option D:** May not be the preferred regimen due to potential side effects or resistance issues.
**Clinical Pearl / High-Yield Fact**
It's crucial to initiate PEP as soon as possible after exposure, ideally within **2 hours**, to maximize its effectiveness. The regimen should be taken for **28 days** to ensure optimal protection against HIV infection.