Horses and Humans: Will We Ever Conquer Influenza?

A horse is prepared for X-ray at the Newmarket Equine Hospital in Newmarket, England, on Feb. 11, 2019. After horse racing was suspended for six days due to an outbreak of equine influenza, racing across the UK resumed on Feb. 13, 2019. Dan Kitwood/Getty Images

Commentary

LONDON—In December 2018, I wrote about the pros and cons of “the jab,” as the influenza vaccine is called in Britain.