Human herpesvirus 6 (HHV6) infection

Area of Science:

• Virology
• Immunology
• Infectious Diseases

Background:

• Human herpes virus-6 (HHV-6), identified in 1986, is the sixth herpesvirus family member.
• HHV-6 comprises two variants, HHV-6A and HHV-6B, with HHV-6B predominantly causing infections in healthy infants.
• The virus targets CD4+ T-lymphocytes, utilizing CD46 as a co-receptor, and establishes lifelong latency in various cells and organs.

Purpose of the Study:

• To review the clinical manifestations of HHV-6 infection in healthy children.
• To discuss syndromes linked to HHV-6 reactivation in immunocompromised individuals.
• To explore the evidence associating HHV-6 with conditions like multiple sclerosis, malignancy, and drug hypersensitivity.

Main Methods:

• Literature review of published data on HHV-6 infections.
• Analysis of clinical manifestations in pediatric populations.
• Evaluation of evidence for HHV-6 associations with specific diseases.
• Review of antiviral treatment efficacy in complicated and immunocompromised cases.

Main Results:

• HHV-6B is the primary cause of infection in infants.
• The virus establishes latency in monocytes/macrophages, salivary glands, brain, and kidneys.
• Associations between HHV-6 and multiple sclerosis, malignancy, infectious mononucleosis, drug hypersensitivity, and skin eruptions are discussed.

Conclusions:

• HHV-6 infection presents diverse clinical scenarios in both healthy children and immunocompromised patients.
• Further research is warranted to elucidate the role of HHV-6 in various pathological conditions.
• Antiviral therapies show potential in managing complicated and opportunistic HHV-6 infections.