I learned this from an online employees Town Hall MEEI + MGH did recently (where I work), and this is a big point:
If you get tested for COVID-19 and don't get results back in less than 7 days, then there's actually a decent chance the results are not valid, whether it's positive or negative.
The logic is, someone who got tested March 12 might have been negative on March 12, but then became positive days later. However, the test is from March 12, so when that person gets it back as "negative" March 19, it's not the "current" status.
What that means is, there might actually A TON of cases in the U.S. Maybe in other countries too, but honestly the U.S has been criticized the most about testing capacity and delayed results compared to others'.
That could mean, for example, that even though the data states there's ~2400 positive cases out of 24,000 tests in Massachusetts, it might actually be more like 8,000 positive cases in MA now, as a portion of those who tested negative may actually be positive. As we've seen, some people aren't getting their test results back for a good 2+ weeks.
Also, FWIW, they seem to think the working from home/remote work will last for at least another month. Despite what Trump hopes. Late April is the best case scenario, but it's more like May. For safety precautions though, hospitals and clinics will remain very limited for a while, maybe even into the summer months. But they'll gradually allow for elective surgeries and a few other procedures to return again.