Enterically transmitted Non-A Non-B (NANB) hepatitis?
## **Core Concept**
Enterically transmitted Non-A Non-B (NANB) hepatitis refers to a form of liver inflammation caused by viruses that are not hepatitis A or B, and are primarily spread through the fecal-oral route. This category of hepatitis was identified based on the exclusion of hepatitis A and B infections. The most well-known form of enterically transmitted NANB hepatitis is caused by the hepatitis E virus (HEV).
## **Why the Correct Answer is Right**
The correct answer, , corresponds to Hepatitis E virus (HEV), which is the primary cause of enterically transmitted NANB hepatitis. HEV is known to cause acute hepatitis that is usually self-limiting but can become severe, especially in pregnant women. It is transmitted primarily through the fecal-oral route, often through contaminated water or food. The virus replicates in the liver and is excreted in the bile and feces.
## **Why Each Wrong Option is Incorrect**
- **Option A:** - This option does not correspond to the correct answer because it is not specified. However, Hepatitis C (HCV) is a blood-borne virus and not primarily enterically transmitted.
- **Option B:** - Similarly, this option is incorrect for the same reason as Option A; it does not match HEV.
- **Option D:** - This option is incorrect because it also does not match HEV, and other forms of hepatitis like Hepatitis D (HDV) are primarily transmitted through blood and require co-infection with Hepatitis B.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that Hepatitis E (HEV) infection can lead to severe disease in pregnant women, particularly in the third trimester, with high mortality rates reported in some regions. This highlights the importance of considering HEV in the differential diagnosis of acute hepatitis, especially in travelers to or from endemic areas and in pregnant women.
## **Correct Answer:** . Hepatitis E virus (HEV).