The Contact Tracing Collaborative developed a traffic light system to alert the public of COVID-19 risk levels. Most recent data has the four municipalities in the yellow or “moderate” risk zone.
The Contact Tracing Collaborative developed a traffic light system to alert the public of COVID-19 risk levels. Most recent data has the four municipalities in the yellow or “moderate” risk zone. Credit: Contributed Image

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.

Despite an elevated percent positivity rate compared to last week, the risk of COVID-19 risk remains “moderate” in the four communities involved in the Contact Tracing Collaborative, which consists of Greenfield, Deerfield, Montague and Sunderland.

According to Greenfield Health Director Jennifer Hoffman, cluster infections (of three or more people at one site) also remain slightly high, though consistent compared to last week, with seven documented clusters. Case incidences and hospital rates also remain stable.

As a result, the Contact Tracing Collaborative communities remain in the yellow zone with a moderate risk of COVID-19 transmission, with masking encouraged.

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. Health officials also continue to talk with nursing homes, businesses and schools to track cluster infections.

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.