- Second COVID-19 case of unknown origin confirmed in US China.org.cn
- Another coronavirus case of unknown origin identified in California The Verge
- Coronavirus: 2d US 'community spread' case in Santa Clara County - Business Insider Business Insider
- Leak claims California found second case of ‘unknown origin’ coronavirus SlashGear
- Northern California finds a second case of coronavirus spread through the community Livescience.com
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