At least six children at a day care in Lubbock, Texas, tested positive for measles amid the state's growing outbreak, local officials confirmed to CBS News Tuesday. On Monday, Lubbock Public Health issued immunization recommendations for the whole county following the cases at Tiny Tots U Learning Academy on South University Avenue.

Public health officials say a day care facility in a Texas county that's part of the measles outbreak has multiple cases, including children too young to be fully vaccinated.

State health officials added four more counties to what they consider “outbreak areas” and advise those visiting or living in those counties to consult measles vaccination guidance for those areas.