LONDON—Oil prices eased after early gains on Thursday after measures by some governments to slow the spread of the Omicron coronavirus variant, though losses were capped by comments from vaccine makers about the efficacy of their jabs. Brent crude futures fell 47 cents, or 0.6 percent, to $75.35 a barrel by 1004 GMT after touching a peak of $76.70. U.S. West Texas Intermediate (WTI) crude futures fell 31 cents, or 0.4 percent, to $72.05 after a session high of $73.34. British Prime Minister Boris Johnson imposed tougher COVID-19 restrictions in England on Wednesday, saying people should work from home where possible and wear masks in public places and show COVID-19 vaccine passes for entry to certain events and venues. Denmark also plans new restrictions, including closure of restaurants, bars, and schools, while China has halted group tourist trips from Guangdong. “Oil demand is thus unlikely to escape completely unscathed, though …