RABV-G mRNA vaccine stored at temperatures up to 70°C retains immunogenicity and protection for up to three months.

<p>mRNA vaccine or licensed vaccines were stored for one month (A-F) or three months (G-I). Storage temperature was 60°C (A-C), 70°C (D-F), or as indicated in the figure (G-I). Vaccine or control injections were done on day 0 and 21. Induction of rabies virus neutralizing antibodies was measured 35 days after first immunization (A, D, G; dashed line indicates the WHO standard titer of 0.5 IU/ml). Mice were challenged with a 40fold MLD<sub>50</sub> of rabies virus CVS-11 on day 47 (B, C, E, F) and day 51 (H-I), respectively. Survival (B, E, H) and body weight (C, F, I) was recorded. For antibody titers, the mean is indicated, for body weight kinetics the mean and standard deviation is given (n = 6 to 8). Significance *p<0.1, **p<0.01, ***p < .001 to HDC or buffer control group in A and D/G, respectively, was calculated using the Mann Whitney test. Groups included in A-F were performed simultaneously; therefore buffer control displayed in D-F is valid for all groups.</p>