Varicella-zoster virus (VZV) is often asymptomatic in primary infections. Primary VZV infection can result in chickenpox (varicella) characterized by malaise, fever and an extensive vesicular rash which can lead to pneumonia in adults, particularly in pregnant woman. Even after clinical symptoms of varicella have resolved, VZV remains dormant in the nervous system of the host in the trigeminal and dorsal root ganglia. In about 10- 20% of cases, VZV reactivates later in life producing a disease known as herpes zoster or shingles.