True about herpes virus is?
**Core Concept**
Herpes viruses are a family of DNA viruses that cause a range of diseases in humans, primarily characterized by the development of latent infections that can reactivate at a later stage. The herpesvirus family includes eight distinct types, with herpes simplex virus (HSV) types 1 and 2 being the most well-known.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of herpes virus infections. Herpes viruses have a unique ability to establish latency in host cells, allowing them to evade the host immune system and reactivate at a later stage. This is mediated by the viral gene products that regulate viral replication and latency. The correct answer is likely related to this concept.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because herpes viruses do not cause cancer directly. While some herpes viruses have been associated with an increased risk of certain cancers, such as Kaposi's sarcoma and nasopharyngeal carcinoma, they do not cause cancer through a direct oncogenic mechanism.
**Option B:** This option is incorrect because herpes viruses are not typically transmitted through the respiratory route. While some herpes viruses, such as HSV-1, can be transmitted through oral contact, the primary route of transmission is through skin-to-skin contact or through the birth canal during childbirth.
**Option C:** This option is incorrect because herpes viruses do not cause autoimmune diseases directly. While some herpes viruses have been associated with autoimmune phenomena, such as Guillain-Barré syndrome, they do not cause autoimmune diseases through a direct immune-mediated mechanism.
**Option D:** This option is incorrect because herpes viruses are not typically transmitted through the fecal-oral route. While some herpes viruses, such as HSV-2, can be transmitted through genital contact, the primary route of transmission is through skin-to-skin contact or through the birth canal during childbirth.
**Clinical Pearl / High-Yield Fact**
Herpes viruses are a common cause of neonatal sepsis, with HSV-2 being the most common cause. Pregnant women with active herpes lesions are at increased risk of transmitting the virus to their newborn, highlighting the importance of antiviral prophylaxis during pregnancy.
**Correct Answer:** B.