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Ms. Terrie is a clinical pharmacy writer based in Haymarket, Virginia.
Herpes zoster, commonly referred to as shingles, is a painful condition caused by the reactivation of the latent varicella-zoster virus (VZV) within the sensory ganglia.1 Shingles is characterized by clusters of blisters that develop on one side of the body in a bandlike pattern and can cause severe pain that may last for weeks, months, or years.2 The Centers for Disease Control and Prevention (CDC) reports that 1 in 3 individuals will develop herpes zoster in his or her lifetime, accounting for >1 million cases annually.1,2
Complications attributed to herpes zoster occur in almost 50% of older persons with the condition.3,4 The most frequent debilitating complication, which also increases with advancing age, is postherpetic neuralgia, a neuropathic pain syndrome that persists or develops after the dermatomal rash has healed.1,4-6 Examples of other complications include conjunctivitis, uveitis, episcleritis, scleritis, retinitis, choroiditis, and optic neuritis.1 Although no clearly defined causes for the reactivation of the VZV are known (other than increasing age), patients who are immunocompromised are at risk for reactivation.7
The CDC's Advisory Committee on Immunization Practice announced on May 15 its recommendation that individuals =60 years of age be vaccinated against herpes zoster.1,2 This recommendation replaces the provisional recommendation made by the CDC in 2006.2
In June 2005, Oxman et al reported in the New England Journal of Medicine that the use of the zoster vaccine decreased the burden of illness due to herpes zoster by 61.1%; decreased the incidence of postherpetic neuralgia by 66.5%; and reduced the incidence of herpes zoster by 51.3%.3 In addition, the study concluded that the zoster vaccine reduced the morbidity associated with herpes zoster and postherpetic neuralgia among older adults.3
Zostavax (Merck & Co Inc), which was approved by the FDA on May 25, 2006, is the only available vaccine to prevent herpes zoster. It is available as a lyophilized preparation of live, attenuated VZV.8 Zostavax is indicated for the prevention of herpes zoster in individuals ≥60 years of age, including individuals who have reported a previous episode of zoster or who have chronic medical conditions, such as chronic renal failure, diabetes, rheumatoid arthritis, or chronic pulmonary disease, unless those conditions or other comorbid conditions are contraindicated for its use.1,8 Zostavax is not indicated for the treatment of herpes zoster or postherpetic neuralgia.
The use of Zostavax is contraindicated in individuals with a history of anaphylactic/anaphylactoid reaction to gelatin, neomycin, or any other component of the vaccine; individuals with a history of primary or acquired immunodeficiency states; or those on immunosuppressive therapy.8 Vaccination should be deferred in individuals with active untreated tuberculosis. It also is contraindicated in children, women of childbearing age, and should never be administered to pregnant females.8
For more information on herpes zoster and the zoster vaccine, go to the Centers for Disease Control and Prevention Web site at www.cdc.gov/vaccines/vpd-vac/shingles/default.htm.
The vaccine should be stored frozen and reconstituted immediately upon removal from the freezer. The diluent supplied by the manufacturer can be stored at room or refrigerated temperature. Prior to administration, the vaccine should be reconstituted with the diluent supplied by the manufacturer and should be administered immediately to minimize loss of potency. The vaccine should be discarded if not used within 30 minutes of reconstitution.
Zostavax should be administered as a single 0.65-mL dose subcutaneously in the deltoid region of the upper arm. The most common adverse reactions are associated with site injection reactions, such as erythema, pain, tenderness, swelling, pruritus, hematoma, and warmth.8 Examples of systemic reactions reported include headache, fever, rhinitis, diarrhea, flu syndrome, respiratory infection, and asthenia.8