Who is liable for the deaths and illnesses? Businesses point to people. People point to businesses. Disclosure should absolutely be an obligation.
businesses generally have 'vicarious liability' in matters like communicable disease. A business cant become infected and therefore, cant transmit.
If there is defiance of mandate or willful failure to address a potential source of transmission, that could be a different story, but it would be virtually impossible for an infected person to prove (in a legal sense) the source of his infection.
At this time, covid exposure is an inherent risk of life on earth.