Cambridge Health Alliance will expand and reconfigure its in-hospital psychiatric services over the next two years, especially for children and adolescents, including a move to the former Somerville Hospital from them CHA Cambridge Hospital.

Neville Center at Fresh Pond, one of Cambridge’s nursing homes, has opened a 14-bed isolation unit for patients recovering from coronavirus, admitting seven patients so far.

The Cambridge Health Alliance has received $47.5 million from the federal government under a fund authorized by Congress to help health care organizations deal with the Covid-19 pandemic, but is checking to see if the amount is correct under the terms of the aid program.

Fire Department paramedics will go door-to-door in public housing developments housing the elderly and younger disabled tenants to offer Covid-19 tests to residents, according to preliminary plans calling for visits to all 1,200 households by Memorial Day.

Cambridge will offer Covid-19 tests to tenants at the city’s public housing developments for the elderly and also locate a testing site in The Port neighborhood to focus on older, low-income, black and Hispanic residents. A North Cambridge site could follow.

It seems like a simple question: How many Cambridge residents have been tested for Covid-19? The answer would be important to help assess the true extent of infection in any place, public health experts say. Yet no one knows, or if they do, they’re not saying.

Cambridge is getting a new Covid-19 testing site that will be open to residents of the city even without symptoms, a significant expansion of testing opportunities as long as a swab supply holds out. But there’s debate about siting between the hardest-hit ZIP code and most afflicted population.

Cambridge Health Alliance is ready to offer its testing program for Covid-19 to the public after receiving 3,500 swabs from the state for taking samples from patients.

Efforts to enforce mask-wearing, isolation and social distancing are picking up even as Cambridge health officials talked Tuesday about a “glimmer of hope” that the city was seeing its peak in the current wave of coronavirus infections.

Cambridge Health Alliance has tried every avenue it could find to test more patients for Covid-19 but, like many other health care systems, struggles to increase the number by finding more swabs, saline fluid and chemicals to analyze the samples.