LA JOLLA, Calif. (KGTV) — After weeks of decline, experts who track coronavirus levels in San Diego's wastewater say they are starting to see a slight uptick in viral load, which could be an indication that the new wave of the pandemic that has hit foreign countries has now reached Southern California.

“This slight uptick is not something to be alarmed about, but something we’re watching with caution," Dr. Christopher Longhurst, Chief Medical Officer at UC San Diego Health, told ABC 10News Monday.

Several countries, including the United Kingdom and China, have seen a recent spike in COVID cases, possibily linked to the new BA.2 subvariant of Omicron. In the United States, experts have been looking more and more to wastewater testing as the best early indicator of a COVID surge. UCSD began testing wastewater early in the pandemic, with broader testing also now being done at other sites in San Diego County, including the Point Loma Sewage Treatment Plant.