The Medical journal of Australia
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To better understand the role that diagnostic test-ordering behaviour of general practitioners has on current pertussis epidemiology in Australia. ⋯ An increase in pertussis testing following recognition of early epidemic cases may have led to identification of previously undetected infections, resulting in a further increase in notified disease and awareness among GPs. The changing likelihood of being tested may also be due to expanding availability and use of PCR testing in Australia.