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Stability testing of a lyophilized trivalent IPV formulation containing 10% (w/v) sorbitol, 8.5% (w/v) MgCl2 and 8.5% (w/v) MSG at 25°C (a), 37°C (b) or up to 4 weeks at 45°C (c). The freezedried formulation (FD IPV) was compared with the conventional liquid IPV (L IPV) and a liquid IPV dialyzed against McIlvaine buffer (L dIPV), which is the buffer of choice during lyophilization.
