The chance that a health worker gets HIV from an accidental needle prick is: March 2013 (b, h)
**Core Concept**
The risk of HIV transmission through a needlestick injury is a critical consideration for healthcare workers. The underlying principle being tested here is the likelihood of HIV transmission through a percutaneous exposure, which depends on various factors including the viral load of the source patient, the type of exposure, and the promptness and adequacy of post-exposure prophylaxis (PEP).
**Why the Correct Answer is Right**
HIV transmission through a needlestick injury is a well-documented risk. The likelihood of transmission varies depending on the viral load of the source patient, with higher viral loads increasing the risk. Studies have shown that the risk of HIV transmission through a needlestick injury is estimated to be around 0.3% (1 in 333) when the source patient is HIV-positive and has a high viral load. This risk is significantly reduced with prompt initiation of PEP, which can prevent infection in up to 90% of cases.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is likely too high and would be considered an overestimation of the actual risk.
* **Option B:** This option may be too low and doesn't accurately reflect the estimated risk of HIV transmission through a needlestick injury.
* **Option C:** This option is not a plausible answer choice, as the risk of HIV transmission is not 100%.
**Clinical Pearl / High-Yield Fact**
It's essential for healthcare workers to be aware of the risks associated with needlestick injuries and to follow strict protocols for PEP administration in the event of an exposure.
**Correct Answer: B. 0.3%**