COVID-19 rates in the Southwestern United States reached 12.5% — the highest in the nation — according to new data from the U.S. Centers for Disease Control and Prevention released this week. Meanwhile, Los Angeles County recorded the highest COVID levels in its wastewater since February.

The spike is being driven by the new, highly contagious “Stratus” variant.

The COVID-19 virus, SARS-CoV-2, mutates often, learning to better transmit itself from person to person and evade immunity created by vaccinations and previous infections.

The Stratus variant, first detected in Asia in January, reached the U.S. in March and became the predominant strain by the end of June. It now accounts for two-thirds of virus variants detected in wastewater in the U.S., according to the CDC.

The nationwide COVID positivity rate hit 9% in early August, surpassing the January post-holiday surge, but still below last August’s spike to 18%. Weekly deaths, a metric that lags behind positivity rates, has so far remained low.

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