Use of cold-chain to assess vaccine exposure to adverse temperatures in rural Tanzania.

A study was carried out in Tabora region to determine the magnitude of exposure of vaccines to adverse temperatures using the Cold Chain Monitors (CCMs). Except for refrigerators in the regional hospital, almost all refrigerators were found to be exposed to adverse temperature. The RAK type of refrigerators were found to be more exposed to adverse temperature than the RCW type. While an alternative type of refrigerator suitable for tropical countries is being sought there is a need of focusing more attention on improving cold chain system in the peripheral facilities.