Los Angeles County sees exponential growth in Covid-19 cases as Delta variant becomes dominant, worrying officials

Los Angeles County — the most populous county in the US — is seeing “exponential growth” of Covid-19 cases as Delta takes over as the dominant strain, according to local health officials.Los Angeles County — the most populous county in the US — is seeing “exponential growth” of Covid-19 cases as Delta takes over as the dominant strain, according to local health officials.