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21
The trial also showed that when an unimmunised child catches
Whooping Cough, three times out of four the disease is severe ;
the immunised child only had a severe attack in one in four cases.
This finding is borne out by the experience of our staff.
The General Practitioners are now being asked whether a child
whom they notify with Whooping Cough has been immunised and an
estimate is made of the severity of the attack. By this method it is
hoped shortly to obtain local figures to indicate the value of
immunisation.
The vaccine is constantly being modified and improved so that
conclusions drawn regarding one batch of vaccine may not be true
even a short.time later. That we are on the right lines in the
use of these vaccine has been shown by the very excellent results
obtained by the Michigan Public Health Department.

GENERAL PRACTITIONERS
1951 1950
Primary 571 612
Boosters 154 —