Highest chance of transmission after needle stick injury is for –
**Core Concept**
The question is testing the student's knowledge of the risk of transmission of bloodborne pathogens through needlestick injuries. The underlying principle is the viral load and the type of virus involved in the injury.
**Why the Correct Answer is Right**
HIV (Human Immunodeficiency Virus) has a high viral load in the blood, making it more likely to be transmitted through a needlestick injury. The risk of HIV transmission after a needlestick injury is estimated to be around 0.3%. This is because HIV is a highly infectious virus that can be transmitted through contact with infected blood. The risk of transmission is higher with HIV compared to other bloodborne pathogens like HBV (Hepatitis B Virus) and HCV (Hepatitis C Virus).
**Why Each Wrong Option is Incorrect**
**Option A:** HBV has a lower viral load in the blood compared to HIV, making it less likely to be transmitted through a needlestick injury.
**Option B:** HCV has a lower risk of transmission through needlestick injuries compared to HIV, with an estimated risk of around 1.8%.
**Option C:** This option is not relevant to the question and does not provide any information about the risk of transmission of bloodborne pathogens.
**Clinical Pearl / High-Yield Fact**
The Centers for Disease Control and Prevention (CDC) recommend post-exposure prophylaxis (PEP) for healthcare workers who are exposed to HIV through a needlestick injury. PEP involves administering antiretroviral medications to prevent the transmission of HIV.
**Correct Answer: D. HIV.