SALEM — Oregon health officials reported a continued decline in known coronavirus cases this week, with 35% fewer infections than the previous week.

At an average of about 330 new infections reported each day over the last week, reported cases are about where they were in the post-surge trough Oregon saw in March. Testing has fallen, too, though only by about 13%. Reported cases are widely considered an undercount, however, given at-home tests don’t have to be reported to the state.

Still, as of Thursday, Oct. 27, no Oregon counties had high levels of community spread, according the U.S. Centers for Disease Control and Prevention. Five counties had medium levels — Josephine, Jackson, Klamath, Lake and Grant.

Local and national health experts have warned that the coronavirus could come surging back this fall, with the potential for infections to hit the second-highest level of any surge during pandemic, according to an Oregon Health & Science University analysis. The concomitant surge in hospitalizations could peak in mid-December, according to OHSU’s Oct. 14 analysis.

Another method of monitoring the prevalence of infections, wastewater data, could be indicating an uptick in the virus. As of about a week ago, monitoring sites in Portland and Grants Pass showed evidence of a “sustained increase” in infection levels, state data show. Most of the other approximately 30 active sites show no change in infection levels in their communities. Sites in Canby, Silverton, Eugene and Ashland have shown a sustained decrease in infection levels, according to week-old data.

Since it began: Oregon has reported 908,188 confirmed or presumed infections and 8,680 deaths.