Rujukan Malaysia :
Rujukan Luar Negara :
Varicella-Zoster Viral Infection
The
Varicella-Zoster Virus (VZV) causes two distinct diseases, varicella
(chickenpox), usually during childhood, and herpes zoster, HZ
(shingles), usually much later in adult life.
The
first infection with the varicella-zoster virus causes chickenpox.
After recovery, the virus remains latent (sleeping) in spinal nerves and
may reactivate years later, causing shingles.
Table 1: Comparison of Chicken Pox and Shingles
Chicken Pox
|
Shingles
|
|
---|---|---|
Cause | Caused by primary infection with VZV | Secondary infection from reactivation of latent VZV |
Age when affected | > 90% infection occurs before adolescence | Only occurs in adults with prior VZV infection |
Population affected | Children, but may be extended to adult | Usually adults aged 50 years or older |
Signs & Symptoms | Starts with mild fever
Loss of appetite Headache Tiredness Itchy rash that becomes blisters |
Starts with altered sensation (eg: tingling, burning, numbness at
rash area)
Mild fever Tiredness Unilateral, localized rash that becomes blisters Nerve pain |
Area of rash | Rash is usually widespread over trunk and face with some on arms and legs | Rash is localized, in infected nerve supplies, typically on the back/chest/face |
Mode of transmission | Contact with infected droplets of saliva in the air initially, then contact with liquid from rash blisters may cause chickenpox | Contact with liquid from rash blisters that may cause chickenpox |
Contagiousness | Infectious from 1-2 days before rash appears until after the rash blisters have dried up | Infectious once the rash becomes blisters until after the rash blisters have dried up |
Table 2: Types of vaccine available in Malaysia
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