Protect, modify, deprotect, and vaccinate 30 May 2019 by Vincent Racaniello Influenza virus (left). HA is shown in blue. Right, HA molecule. Colored atoms illustrate variable epitopes on the HA head, and conserved epitopes on the HA stem. A method for making vaccines that induce antibodies against a specific epitope could be used to produce a universal influenza vaccine that would not have to be changed every year. [Read more…] about Protect, modify, deprotect, and vaccinate