After four straight weeks of decline, covid cases were up in the Tri-Town in the week leading up to Nov. 11, according to state covid data.

Among the towns, Marion had seven new cases, Mattapoisett had 15 and Rochester had 15. In total, the Tri-Town had 37 new cases of covid after tallying 19 the previous week.

Over the last four weeks, the Tri-Town has averaged about 34 new cases per week.

At Tri-Town schools, eight new cases were reported. However, ORR covid data has contained several inconsistencies in recent weeks which made the numbers difficult to evaluate.

Meanwhile, single-dose vaccination rates increased dramatically in all three towns in the week leading up to Nov. 11. The spike follows a Centers for Disease Control announcement last week that made children between the ages of 5 and 11 eligible to receive the Pfizer vaccine — the first covid-19 vaccine approved for that age group.

Marion’s single-dose vaccination rate rose by 3%, from 92% to 95%, the largest single-week increase since at least May 6. The town’s full-vaccination percentage also increased from 82% to 83%.

In Mattapoisett, the first-dose rate went from 90% to 92%, the largest increase since May 27. However, its full vaccination rate held steady at 81% for the fourth straight week.

Even Rochester, whose vaccination rates have lagged behind the other towns, saw a significant increase in the proportion of residents who were vaccinated. The single-dose percentage went from 68% to 70% while the full vaccination rate increased from 62% to 63%.

State covid data is released every Thursday evening and ORR covid data is released every Friday evening.