Editor’s note: The Greenfield Recorder has been providing regular updates on the risk level of COVID-19 transmission as wastewater testing results are received.

The COVID-19 transmission risk remains “moderate” in the four communities involved in the Contact Tracing Collaborative, which consists of Greenfield, Deerfield, Montague and Sunderland.

Wastewater levels increased last week compared to the previous week, with 1.13 million copies of virus per liter detected last week compared to 459,000 copies of virus per liter the week before, according to the collaborative. Cluster infections (of three or more people at one site) remained steady at four. The positivity rate, meanwhile, decreased from 6.42% to 4%.

As a result, the municipalities are in the yellow zone, where they have been for about a month, with a “moderate” risk of COVID-19 transmission. Masking is encouraged.

A vaccine clinic will take place on Friday from 4 to 7 p.m. at the Gill-Montague Senior Center, 62 Fifth St. in Turners Falls. Sign up online at bit.ly/3nqtfR1.

In combination with wastewater testing — people with an active COVID-19 infection excrete the virus in their stool and samples from wastewater treatment plants can be analyzed to estimate community virus levels — the four municipalities factor in hospitalization numbers, positivity rates and case numbers to determine risk levels. Meanwhile, health officials continue to talk with nursing homes, businesses and schools to track cluster infections. Members of the collaborative added school absenteeism as an additional measure to compensate for the loss of PCR testing locally.

The following three zones, defined by the Contact Tracing Collaborative, are used to gauge risk levels of COVID-19 transmission in the four communities. For the risk level in the area to change, at least two measures need to apply.

Red zone: High COVID-19 risk

Masking recommended.

■Cluster infections (of three or more people at one site): five or more.

■Percent positive tests out of total tests performed: greater than 10%.

■Hospitalizations: five or more.

■Increase in case trend.

■Increase in wastewater trend.

Yellow zone: Moderate COVID-19 risk

Masking encouraged.

■One to four cluster infections.

■Stable positive testing.

■Fewer than five hospitalizations.

■Stable case incidence.

■Stable wastewater.

Green zone: Low to minimal COVID-19 risk

Masking optional.

■No cluster infections.

■Decrease in positive tests.

■Decrease in hospitalizations.

■Decrease in case incidence.

■Decreased virus copies in wastewater.

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