History / Vocabulary Why is Vaccine from Cow? November 16, 2020November 15, 2020 US Adult LiteracyLeave a comment While we have been waiting for COVID-19 vaccine, have you ever wondered why vaccine is called vaccine? The word, vaccine, is from the Latin word, vacca, which means cow. Please watch the video below to find out the relation between vaccine and cow. Like this:Like Loading...Share this: