Spring is usually the time. There is a natural immunity group on google, though there hasn't been any East Coast activity on there lately.Â
http://groups.google.com/group/natural-immunity/topics
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We're in NY's Hudson Valley (though my parents are near you in PA). It took me 2 parties over 6 months, but we got it for my dd a few years back. (And our cp parties passed it on to 9 out of 12 guests, hoorah!) Now I'm looking for my 19-month-old babe. Ideally I'd have him get it when he's 3, but we'll catch it when we can!
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Best wishes. Do post if you hear anything at all! Keep an open ear around the pediatrician's office, and for shingles at old folks' homes too.