VVM: Vaccine Vial Monitor

The VVM App is a training and support tool designed to assist healthcare workers, supply chain personnel, and immunization program managers in the effective use of Vaccine Vial Monitors (VVMs). The app helps determine whether vaccines can still be safely administered or distributed by estimating their remaining usable time. The estimation is based on user inputs such as: • Manufacturer’s expiry date • VVM type • VVM image or status • Average temperature of the cold store The app applies Arrhenius-based models that simulate the chemical degradation behavior of VVMs. These models are aligned with validated VVM science to provide a practical guide for decision-making during vaccine distribution and administration. Intended users include: • Healthcare workers determining whether to administer or discard vaccines • Supply chain staff assessing vaccine viability during storage and transport • Program managers planning vaccine movements within the cold chain Disclaimer: This app is intended for training and logistical support only. Users must follow all official immunization program protocols and manufacturer guidance, including: 1. National immunization guidelines and standard operating procedures 2. Manufacturer instructions 3. World Health Organization (WHO) recommendations 4. Supervisory and professional judgment of qualified personnel Actual vaccine viability may vary depending on environmental conditions, equipment performance, handling practices, and data accuracy. By using this app, you acknowledge that it serves solely as a training and support tool for vaccine logistics, and that ultimate responsibility for vaccine management lies with the implementing health program and its personnel. The developers and publishers of this app accept no liability for vaccine loss, misuse, or any consequences arising from its use.