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Anti-Gardasil® 9 antibody titers in mice after immunization with Gardasil® 9 stored for 3 months at different temperatures. Mice were immunized twice with either liquid or spray-dried Gardasil® 9 stored at 4°C, 25°C/60% RH, and 40°C/75% RH or with PBS (control) at three-week intervals. Sera were collected three weeks after the last immunization and anti-Gardasil® 9 IgG titers were determined by ELISA. Each datum represents the IgG antibody value of an individual mouse.
