Vaccines for MERS, SARS and HIV

Why don't we have a vaccine for SARS? MERS? HIV? These viruses have been around longer than SARS-CoV-2. A mini-thread to provide some perspective and even a little dose of optimism. We are not in the same situation here. 1/7

— Natalie E. Dean, PhD (@nataliexdean) May 25, 2020