Watertown’s COVID-19 cases continued to increase for the third straight week. according to the Mass. Department of Public Health report, and nearly 1-in-5 Watertown residents have at least started the vaccination process. The Town had 93 cases over the previous 14 days, according to the state’s report from April 8, a dozen more than the previous week. The positive test rate also rose for the third straight week, from 1.48 percent on April 1 to 1.72 percent on April 8.