Hi Walter I sent an e-mail to the Manufacturer not a supplier here is the reply Dear Ian Thank you for your email regarding the use of Colombovacâ„¢ PMV. The data sheet states: Use entire contents of vial once opened. Therefore, in the absence of any further data the advice would be to use the entire contents of the vial immediately once opened, ideally within 1 hour. Use of the vaccine after the vial has been opened for more than 1 hour, certainly more than 2 hours, will likely compromise the efficacy of the vaccine. Best wishes Hilary Hilary Hayward Technical Advisor Zoetis UK Ltd | ipc 2-2, Walton Oaks, Dorking Road, Tadworth, Surrey, KT20 7NS Customer Support: +44 (0) 845 300 8034 | Mobile: +44 (0) 7986 312777 | Hilary.Hayward@zoetis.com Visit Us: zoetis.co.uk From: UKVetLine Sent: 19 March 2013 18:37 To: UKVetLine Subject: Zoetis Webmaster Notification Email for New Entry in the Contact US list Hi, New Entry made by user in the Contact US list. Client Identification User's Email : ian.mckay@btinternet.com From: Ian, McKay Topic: Colombovac PMV