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I am building up information in this area bit by bit. Most of the information I have at present relates to England and Wales because this is where I do my research.

How many cases are notified in England and Wales?

 Graph of notified cases in England & Wales (pop. approx 50 million) 1977 to 1999

Graph of notified cases in England & Wales (pop. approx 50 million) 1956 to 1999

To what degree are cases under-notified in England and Wales?
You can see a histogram of how the number of whooping cough cases I have counted compares with the number notified in England and Wales for every year since 1977, after adjustment for population size.  The number of cases I detect varies from about 4 times the official notification rate to about 100 times! More information about this on the Keyworth study

There is more information about different countries on the prevention-immunization page