As the number of coronavirus cases increase in Maryland, medical experts are describing clusters of the virus. WBAL-TV 11 News focuses on what that means, and what's being done in nursing homes and other senior living areas to contain it.|| Late-breaking coronavirus updates | Maryland's latest numbers ||Families with loved ones in nursing homes voiced their fears and concerns about the spread of the virus and the care of residents."Do they have enough equipment to continue this with the personal protection equipment?" asked Steve Davidoff. "The residents of nursing homes, they have delicate systems. They have delicate immune systems. Their immune systems aren't like a healthy person's," said Gregory Bankins. Area health departments report that coronavirus has impacted more nursing homes and other facilities, including Carroll Lutheran Village, a senior living complex in Westminster.Carroll County Health Department officials said three additional residents have tested positive at the senior living complex: a man in his 90s and two women in their 90s.The center continues to monitor all residents and team members and require anyone exhibiting symptoms to self-isolate and seek medical care if needed, officials said.All resident coronavirus test results have been reported from Pleasant View Nursing Home:There are 77 total confirmed cases among facility residents.Eighteen of the facility’s 95 residents tested negative. Eighteen staff at Pleasant View have tested positive.24 have tested negative.21 results are pending.The Health Department said it will follow up with individuals as indicated. At Genesis Loch Raven Center in Parkville, residents and a staff member tested positive. At Pickersgill Retirement Community in Towson, a resident with coronavirus is in the hospital. Towson is considered a cluster for the virus, a geographic area where there is a higher than anticipated outbreak. Health experts said they are identifying clusters as they work to contain the virus. Patients who need hospital care are being sent to those facilities."People that can be cared for in nursing and rehab centers should stay there and get that care," said Joe DeMattos, the president of the Health Facilities Association of Maryland.It's expected we will see more patients at nursing homes, rehab centers and senior living communities get sick -- a full blown surge, over the next three weeks."One of the things working behind the scenes is isolating future COVID-19 cases in specific nursing homes, rehab centers and wards to mitigate the risks going forward," said DeMattos.DeMattos offered assurances to families who have loved ones in nursing homes. "I want people who have loved ones in nursing homes and rehab centers to know Maryland and providers of care are doing everything we can to protect and keep their family members safe," he said.