As the strains of bacteria that are not killed by antibiotics proliferate, increasing numbers of people are at risk of severe illness and even death. Dr Rogier Hopstaken from Star-shl Diagnostic Centres in the Netherlands has shown that a simple, yet effective technique may be the answer to antibiotic over-prescription. A C-reactive protein test at primary points of care can indicate whether a patient with a respiratory tract infection has a severe (bacterial) infection and thus, whether antibiotics are required. This test may be our best tool yet to help combat antibiotic resistance in primary care.