A federal strike team of nurses and doctors arrived Saturday to support the staff at the long-term nursing home, Life Care Center of Kirkland, Wash., where officials have announced the deaths of 13 residents and a visitor who were infected with the virus. Tim Killian, a spokesman for the care center, praised the workers who continued to show up even as 70 of the nursing home’s 180 employees have developed symptoms.

“The amount of work and stress that these staff and employees and caregivers are under is tremendous,” Mr. Killian said. “They truly are heroes.”

Earlier on Saturday, Mr. Killian said that the center was still unable to get all of its staff members tested for coronavirus. The home had received 45 virus testing kits, Mr. Killian said, which was not enough for the 63 remaining residents and dozens of staff members.