updated 5/26/2006 9:55:20 AM ET 2006-05-26T13:55:20

A new vaccine that could put the pox on shingles for many adult sufferers of the often painful infection caused by the chickenpox virus has received federal approval, health officials said Friday.

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The Food and Drug Administration approved the vaccine, Zostavax, late Thursday, Merck & Co. Inc. spokeswoman Christine Fanelle said. The vaccine is only for adults who previously have had chickenpox.

“This vaccine gives health care providers an important tool that can help prevent an illness that affects many older Americans and often results in significant chronic pain,” said Dr. Jesse Goodman, director of the FDA’s Center for Biologics Evaluation and Research.

Shingles, also called herpes zoster, strikes when the chickenpox virus reactivates and resumes reproducing after lying dormant for decades in nerve cells in the body.

There are roughly 1 million new U.S. cases of shingles each year. It typically affects the elderly, though anyone with a weakened immune system is vulnerable.

Shingles can cause itching, burning and tingling, as well as a distinctive red rash that develops into pus-filled blisters that later break open and form scabs. Pain, too, is common and can persist in some patients for months or years.

Merck research showed the vaccine reduced the incidence of shingles by half and pain and discomfort by nearly two-thirds.

Side effects
The vaccine’s long-term effectiveness remains unclear. Merck has shown that it works for at least four years, and plans to track patients for a decade. The company also pledged to further study the vaccine’s safety after patients in clinical trials suffered a slightly higher number of serious side effects than did those who received dummy injections, the FDA said. Currently, there is no evidence the vaccine was to blame, the agency added.

The vaccine is intended for use in people 60 and older. “This is going to be the first product of any kind, vaccine or anything else, that can prevent shingles,” said Dr. Jeffrey Silber, senior director of clinical research on biologics and vaccines for Merck Research Laboratories.

Zostavax is based on Merck’s chickenpox vaccine, Varivax, but is 14 times more potent. The FDA approved Varivax in 1995. A majority of American children now receive that vaccine.

Anyone who has had chickenpox can develop shingles. Merck estimates that half of all people who reach age 85 will develop shingles during their lifetime.

Shingles can’t be passed from human to human, but anyone who hasn’t had chickenpox — or never received the vaccine that protects against it — can be infected with the virus if exposed to someone with an active case of shingles.

The approval is welcome news for Merck, which faces thousands of lawsuits over its withdrawn painkiller Vioxx. It’s also just one of several vaccines for which the Whitehouse Station, N.J. company has received — or soon expects to receive — FDA approval.

They include RotaTeq, a vaccine against a common, sometimes dangerous gastrointestinal virus in children, approved in February; and ProQuad, a combined vaccine against measles, mumps, rubella and chickenpox, approved in September.

And early in June, Merck hopes the FDA will approve its Gardasil vaccine against human papillomavirus, the main cause of cervical cancer.

European and Australian health officials earlier this month approved the shingles vaccine, Merck said.

The company is eyeing the roughly 50 million Americans and 100 million Europeans age 60 and older as its largest markets for the single-dose vaccine.

A dose will cost $152.50.

© 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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