Why vaccines are critical to keeping diseases at bay
Vaccines have protected us from deadly pathogens for millennia. Explore how they shield the human body.
Scientists around the world are racing to develop a vaccine for the novel coronavirus that has killed tens of thousands of people since late December. Dozens of companies and institutions are leading the charge at a record pace, and some already have begun the first phase of clinical trials. Yet researchers continue to warn that it could take at least a year to 18 months before a vaccine is ready for public use—a long time to wait for what many see as the best hope to stem the spread of the SARS-CoV-2 virus, which causes COVID-19.
Most vaccines don’t cure diseases; they prevent you from getting infected in the first place. Vaccines contain the same germ