BOSTON (CBS) — A Covid-19 outbreak at Brigham & Women’s Hospital has now grown to 28 confirmed cases. Officials say nine patients and 19 employees have tested positive.

The hospital will now test all of its patients for the coronavirus. Before now, the hospital only required patients be tested before they were admitted.

Brigham’s Infection Control Team believes the outbreak has been contained to two specific inpatient units, 16A and 14CD in the Braunwald Tower.

There are more than 600 people connected to the cluster who are in the process of being tested.

Employees will be offered a voluntary test.