The Shingles vaccine is reported to be safe, effective (see below) a percentage of the time. Sorry you got a case, but lets hope its a very mild one.
How effective is this vaccine?
Zoster vaccine was studied in approximately 38,000 individuals throughout the United States who were age 60 years and older as part of its pre-licensure testing. Half received the vaccine and half received a placebo. Study participants were followed for an average of three years to see if they developed shingles and, if they did, how long the pain lasted. Researchers found that the vaccine reduced the occurrence of shingles by about 50% among persons age 60 years and older. The vaccine is most effective for those age 60–69 years (64%); effectiveness declined with increasing age to 41% for those age 70–79 years and 18% for those age 80 years and older.
Does the zoster vaccine cause shingles?
No, there is no evidence that it can at this time; however, the varicella (chickenpox) vaccine sometimes causes a shingles episode. The risk of shingles following vaccination with chickenpox vaccine appears to be less than that following infection with the chickenpox virus. The majority of cases of shingles following chickenpox vaccination have been mild and have not been associated with serious complications.
Can a person who has received the vaccine infect others with this virus?
No. It is safe to be around infants and young children, pregnant women, or people with weakened immune systems after you get the shingles vaccine. Transmission of the chickenpox virus from a person who has received the shingles vaccine has never been documented. Some people who get the shingles vaccine will develop a chickenpox-like rash near the place where they were vaccinated. As a precaution, this rash should be covered until it disappears.
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karen