Published: January 18, 2021 at 1:30 pm The history of vaccination began formally in 1798, when Edward Jenner showed that inoculating healthy subjects with cowpox, a mild disease of cattle, protected them against smallpox. This was momentous news, as smallpox was one of humanity’s greatest scourges, killing one person in 12 worldwide and all but wiping out the Incas and Aztecs. Others had already experimented with ‘cowpoxing’, but Jenner was the first to report the process and introduce it into medical practice. Advertisement The word ‘vaccination’, from Jenner’s invented...