This study analyzes 295 tweets by four U.S. companies engaged in discovering a vaccine for COVID-19. Tweets were analyzed to understand how their Twitter feeds balanced corporate and product branding (vaccine, medicines, etc.) and disseminated scientific information relating to COVID-19. The results suggest that these companies were actively embedding technical information about COVID-19 in their corporate and product branding. Tweets providing technical and scientific information about the progress made toward developing a COVID-19 vaccine garnered high levels of user engagement from their target audience. Findings from this study indicate the growing importance of technical communication in corporate settings during a public health crisis.