All of the following are true about Herpes group virus except:
**Core Concept**
Herpes group viruses are a family of DNA viruses that cause a range of diseases, from mild skin infections to life-threatening encephalitis. They are characterized by their ability to remain latent in host cells, periodically reactivating to cause recurrent infections.
**Why the Correct Answer is Right**
The Herpes group viruses include Herpes simplex virus (HSV) types 1 and 2, Varicella-zoster virus (VZV), Epstein-Barr virus (EBV), and Cytomegalovirus (CMV). These viruses share a common mechanism of infection, where they infect host cells and hijack their replication machinery to produce new viral particles. HSV and VZV are known for causing recurrent skin infections, while EBV is associated with infectious mononucleosis and CMV can cause severe disease in immunocompromised individuals.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Herpes group viruses are indeed enveloped viruses, which is a characteristic feature of this viral family. Their envelope is composed of lipids derived from the host cell membrane.
**Option B:** This option is incorrect because Herpes group viruses do indeed have a linear double-stranded DNA genome, which is a defining feature of these viruses. This DNA genome encodes for multiple genes involved in viral replication and pathogenesis.
**Option C:** This option is incorrect because Herpes group viruses are not known to cause a single, systemic illness. Instead, they cause a range of diseases, from localized skin infections to life-threatening encephalitis.
**Clinical Pearl / High-Yield Fact**
The Herpes group viruses are highly neurotropic, meaning they have a strong affinity for infecting nerve cells. This is reflected in the ability of these viruses to remain latent in host cells, periodically reactivating to cause recurrent infections.
**Correct Answer: D.**