Two influenza A strains contributing to autumn flu surge

The number of notifications is more than triple that recorded this time last year

A surge in two strains of influenza A has contributed to an unusual autumn spike of flu notifications in Australia, say infectious disease specialists, who are concerned the numbers may continue to rise.

Almost 40,000 laboratory-confirmed cases have been reported nationwide so far this year, with NSW and SA each seeing more than 10,000 cases before the winter season even starts.