Article content The Middlesex-London Health Unit opened its fourth mass vaccination clinic this, as officials plan to open appointments to all adults by the end of May. The health unit opened its newest vaccination clinic at the Earl Nichols arena in south London on Tuesday, a location that will be able to administer about 2,000 shots each day at full capacity. We apologize, but this video has failed to load. Try refreshing your browser. Officials eye vaccine eligibility for all Middlesex-London adults by end of May Back to video Appointments at the Earl Nichols COVID-19 vaccination clinic opened on May 13, the same day vaccine eligibility at the local mass clinics opened to the 40-plus crowd.