A premier resource for information on the statistics of the coronavirus pandemic (among lots of other information) is the Johns Hopkins University website accessed here:
Johns Hopkins Coronavirus Resource Center
The California COVID-19 Dashboard and Resource Center including statistics, news, county-by-county analysis, videos and guidance is here:
The Cyber Infrastructure Security Agency (CISA), part of the Department of Homeland Security, has played a pivotal role in identifying the critical national resources and infrastructure that need the protection and support of government during the pandemic. Chief among these are essential workers, and very highly ranked among them are transportation workers such as merchant mariners. In fact, those that support the supply chains of the economy rank only just below medical professionals and first responders. CISA laid out the importance and the specifics of their strategy to support maritime workers on the front lines of the supply chain several time in this updated memorandum and report on critical workforce infrastructure.
CISA guidance on critical workforce infrastructure