So far it seems that the elderly and impaired in residential/nursing homes and workers in meatpacking plants are especially susceptible to the novel coronavirus and at least the former are more likely to die.
The unseen portion of our population is the category which is now proving vulnerable in Singapore, migrant workers, those living in group quarters.
There may also be vulnerability among the Haredim, the ultra Orthodox Jews.
All of these groups are outside the what I'd call the "core" population of our society, they're marginal-they aren't who we think of when talking about American workers.
Unfortunately for meat eaters, the packinghouse workers are essential.