Varicella zoster virus, like HSV-1, is readily transmitted in aerosol droplets or through direct contact with secretions or broken vesicles. Primary infection by both alphaherpesviruses results in virus replication, during which time the virus gains access to ganglionic neurons and establishes latency.
What causes the varicella zoster virus to reactivate?
The primary factors that impact a person’s cellular immunity are age and medical conditions or medications that suppress the immune system. Post-pregnancy and menopausal hormonal fluctuations in women have also been linked to VZV reactivation.
Why does varicella zoster lie dormant?
Researchers have solved the mystery of why the virus that causes chickenpox and shingles can remain dormant for decades. They found that active genetic material is still present in nerve cells.
Where does varicella zoster virus lay dormant?
The varicella zoster virus lies dormant in the cranial and spinal nerves. When the virus is reactivated, it travels along the affected nerves to the area of the skin served by those nerves, where it causes a distinctive, stripe-like rash.
Is varicella zoster virus latent?
Varicella (chickenpox) is an acute infectious disease. It is caused by varicella-zoster virus (VZV), which is a DNA virus that is a member of the herpesvirus group. After the primary infection, VZV stays in the body (in the sensory nerve ganglia) as a latent infection.
How are shingles caused?
Shingles is caused by varicella zoster virus (VZV), the same virus that causes chickenpox. After a person recovers from chickenpox, the virus stays dormant (inactive) in their body. The virus can reactivate later, causing shingles. Most people who develop shingles have only one episode during their lifetime.
What triggers reactivation of shingles?
The primary risk factor associated with getting shingles is a weakened immune system. When your immune system isn’t functioning properly, VZV can reactivate. As you age, your immune system doesn’t fight off invaders as well.
Where does varicella remain latent?
Is EBV latent?
After you get an EBV infection, the virus becomes latent (inactive) in your body. In some cases, the virus may reactivate. This does not always cause symptoms, but people with weakened immune systems are more likely to develop symptoms if EBV reactivates.
Is varicella zoster virus lytic or lysogenic?
STAT3-mediated upregulation of survivin, which is a cell protein that inhibits apoptosis, was necessary to support VZV infection. Although oncogenic herpesviruses manipulate this pathway to cause tumours, these experiments showed that VZV, which is a lytic herpesvirus, must also induce survivin.
