On Wed, 07 Feb 2001, David Lewandowski wrote:

> They went on to claim that "exemptors" put the public at
> risk because 11% of those who got the measles got them from an "exemptor".
> Think about that statement and do the math for yourself - if 11% of the
> cases were contracted from an "exemptor, that means 89% were contracted
> from someone who was vaccinated! It seems like the study really showed that
> the vaccine didn't work very well when actually put to the test of having
> to protect someone.


A case of selected interpretation ? Here's an extract from the report :

Results  Exemptors were 22.2 times (95% confidence interval [CI], 15.9-31.1)
more likely to acquire measles and 5.9 times (95% CI, 4.2-8.2) more likely to
acquire pertussis than vaccinated children. After adjusting for confounders,
the frequency of exemptors in a county was associated with the incidence rate
of measles (relative risk [RR], 1.6; 95% CI, 1.0-2.4) and pertussis (RR, 1.9;
95% CI, 1.7-2.1) in vaccinated children. Schools with pertussis outbreaks had
more exemptors (mean, 4.3% of students) than schools without outbreaks (1.5%
of students; P = .001). At least 11% of vaccinated children in measles
outbreaks acquired infection through contact with an exemptor.

Andy.