Cultivable (in vitro) hepatitis virus is?
**Core Concept**
Hepatitis A virus (HAV) is a non-enveloped RNA virus belonging to the Picornaviridae family, which can be cultured in vitro using cell lines such as FRhK-4 or A549. This is in contrast to other hepatitis viruses, which are more difficult to culture or require specific conditions.
**Why the Correct Answer is Right**
The correct answer is Hepatitis A because it is the only hepatitis virus that can be easily cultivated in vitro. This is due to its non-enveloped structure, which allows it to infect and replicate in various cell lines. In contrast, Hepatitis B and C viruses require specific conditions and cell types to replicate in vitro, while Hepatitis D virus (HDV) is a defective virus that requires the presence of Hepatitis B virus (HBV) for replication.
**Why Each Wrong Option is Incorrect**
**Option B:** Hepatitis B virus (HBV) is a DNA virus that requires specific conditions and cell types to replicate in vitro, such as HepG2 or HepaRG cell lines. It is not easily cultivable in vitro.
**Option C:** Hepatitis C virus (HCV) is an RNA virus that requires specific conditions and cell types to replicate in vitro, such as Huh-7 or HCV-J5 cell lines. It is not easily cultivable in vitro.
**Option D:** Hepatitis D virus (HDV) is a defective RNA virus that requires the presence of HBV for replication. It is not cultivable in vitro as a standalone virus.
**Clinical Pearl / High-Yield Fact**
It's worth noting that Hepatitis A virus is typically spread through the fecal-oral route, whereas Hepatitis B and C viruses are primarily spread through blood-to-blood contact. This difference in transmission routes is critical in understanding the epidemiology and prevention strategies for each virus.
**✓ Correct Answer: A. Hepatitis A**