Intradermal-delivered DNA vaccine provides anamnestic protection in a rhesus macaque SARS-CoV-2 challenge model

Published: July 29, 2020, 5:01 a.m.

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2020.07.28.225649v1?rss=1 Authors: Patel, A., Walters, J., Reuschel, E. L., Schultheis, K., Parzych, E., Gary, E. N., Maricic, I., Purwar, M., Eblimit, Z., Walker, S. N., Guimet, D., Bhojnagarwala, P., Doan, A., Xu, Z., Elwood, D., Reeder, S. M., Pessaint, L., Kim, K. Y., Cook, A., Chokkalingam, N., Finneyfrock, B., Tello-Ruiz, E., Dodson, A., Choi, J., Generotti, A., Harrison, J., Tursi, N. J., Andrade, V. M., Dia, Y., Zaidi, F. I., Anderson, H., Lewis, M. G., Muthumani, K., Kim, J. J., Kulp, D. W., Humeau, L. M., Ramos, S., Smith, T. R., Weiner, D. B., Broderick, K. E. Abstract: Coronavirus disease 2019 (COVID-19), caused by the SARS-CoV-2 virus, has had a dramatic global impact on public health, social, and economic infrastructures. Here, we assess immunogenicity and anamnestic protective efficacy in rhesus macaques of the intradermal (ID)-delivered SARS-CoV-2 spike DNA vaccine, INO-4800. INO-4800 is an ID-delivered DNA vaccine currently being evaluated in clinical trials. Vaccination with INO-4800 induced T cell responses and neutralizing antibody responses against both the D614 and G614 SARS-CoV-2 spike proteins. Several months after vaccination, animals were challenged with SARS-CoV-2 resulting in rapid recall of anti-SARS-CoV-2 spike protein T and B cell responses. These responses were associated with lower viral loads in the lung and with faster nasal clearance of virus. These studies support the immune impact of INO-4800 for inducing both humoral and cellular arms of the adaptive immune system which are likely important for providing durable protection against COVID-19 disease. Copy rights belong to original authors. Visit the link for more info