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To: KLP who wrote (4211)	12/15/2002 11:13:18 PM
From: Bilow	Read Replies (1) \| Respond to of 6901

Hi KLP; Re: "I thought I read that the vaccination only lasted 10 years." Here's a good link. It seems that if you're old enough to have gotten your booster vaccination (which would be 41 or older in Japan), then your estimated immunity is >90%: Duration of Immunity after Smallpox Vaccination: A Study on Vaccination Policy against Smallpox Bioterrorism in Japan Isao Arita, July 4, 2002 SUMMARY: The success of global smallpox eradication in 1980 led all the nations of the world to discontinue smallpox vaccination. To date, however, the threat of deliberate release of smallpox virus has led health authorities to reconsider smallpox vaccination and a the same time, to urge to evaluate duration of the immunity of the population vaccinatted before 1980. Although available data is scarce and incomplete, the study suggests that protective immunity lasts longer in a good percentage of vaccinees, although the real percentage and duration are not known. Accordingly, how to establish a national vaccination policy for preparedness in Japan and elsewhere was discussed. The study is intended to cause interest and debate among the medical and public health community. ... Vaccinated, first & second revaccination, born before 1961 Circa >90% ... nih.go.jp The above was the first (scientific article) hit that came from the following google search. You're welcome to search through more if you like. I'd like to hear what the others say: google.com -- Carl