Storage of vaccines in the community: weak link in the cold chain?

OBJECTIVE To assess quality of storage of vaccines in the community. DESIGN Questionnaire survey of general practices and child health clinics, and monitoring of storage temperatures of selected refrigerators. SETTING Central Manchester and Bradford health districts. SUBJECTS 45 general practices and five child health clinics, of which 40 (80%) responded. Eight practices were selected for refrigeration monitoring. MAIN OUTCOME MEASURES Adherence to Department of Health guidelines for vaccine storage, temperature range to which vaccines were exposed over two weeks. RESULTS Of the 40 respondents, only 16 were aware of the appropriate storage conditions for the vaccines; eight had minimum and maximum thermometers but only one of these was monitored daily. In six of the eight practices selected for monitoring of refrigeration temperatures the vaccines were exposed to either subzero temperatures (three fridges) or temperatures up to 16 degrees C (three). Two of these were specialised drug storage refrigerators with an incorporated thermostat and external temperature gauges. CONCLUSION Vaccines were exposed to temperatures that may reduce their potency. Safe storage of vaccines in the clinics cannot be ensured without adhering to the recommended guidelines. Provision of adequate equipment and training for staff in maintaining the "cold chain" and the use and care of equipment are important components of a successful immunisation programme.