HONG KONG—Hong Kong said on Monday it would shorten the quarantine period for vaccinated people arriving in the city to 7 days from 14, provided travelers show sufficient antibodies against the CCP (Chinese Communist Party) virus, commonly known as the novel coronavirus. City government leader Carrie Lam told a media briefing the shorter period of quarantine would only be for people who had a second vaccination dose at least 14 days before their arrival. The new rule is due to come into effect at the end of the month, she said. The Chinese-ruled city has some of the toughest quarantine rules globally with residents ordered to stay in quarantine hotels for up to 21 days after arriving. The decision to reduce the time in quarantine comes as the city tries to encourage more of its 7.5 million people to get vaccinated against the CCP virus. Only about 17 percent of residents …