Which of the following infection has highest chances of transmission by blood transfusion?
**Core Concept**
The transmission of infections through blood transfusion is a significant concern in transfusion medicine. The risk of transmission depends on the infectious agent's characteristics, such as its stability, infectivity, and presence in the blood product. The most critical factor is the agent's ability to survive the blood storage process and the recipient's immune response.
**Why the Correct Answer is Right**
Hepatitis B virus (HBV) has a high risk of transmission through blood transfusion due to its ability to remain infectious in stored blood products. HBV's envelope protein, HBsAg, is relatively stable and can withstand the storage conditions, making it a significant risk for transfusion-transmitted infections. Furthermore, HBV can cause chronic infection, and its transmission can lead to severe liver disease.
**Why Each Wrong Option is Incorrect**
**Option A:** HIV (Human Immunodeficiency Virus) is also a significant concern for blood transfusion transmission, but its risk is lower compared to HBV due to the implementation of robust screening measures and the use of nucleic acid testing (NAT).
**Option B:** Hepatitis C virus (HCV) is another bloodborne pathogen, but its transmission risk through blood transfusion is lower than HBV due to the improved screening methods and the use of NAT.
**Option C:** West Nile virus (WNV) is primarily transmitted through mosquito bites and has a low risk of transmission through blood transfusion. The risk is further mitigated by screening and testing of blood donations.
**Clinical Pearl / High-Yield Fact**
Remember the **"HBV"** mnemonic for high-risk bloodborne pathogens: **H**epatitis B Virus, **B**loodborne viruses like HIV and HCV, and **V**iral infections like WNV.
**Correct Answer: A. Hepatitis B virus**