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.

The number of measles cases exceeded 500 in Texas on Tuesday, according to the state’s health department, which made the update days after a second Texas child died after contracting the highly contagious illness that has been confirmed in at least 20 states.

A second child in Texas has died of measles, according to the Texas Department of State Health Services, in a growing outbreak that has infected hundreds of people, the vast majority in unvaccinated communities in Texas.

The Texas Department of State Health Services said Tuesday that the number of measles cases in the outbreak that began in January has risen to 505 confirmed infections with 57 hospitalizations. Based on the most recent data,

Three people have died from measles-related illnesses in the U.S. since the highly contagious virus started ripping through West Texas in January.

Health experts say driving up vaccination rates in affected areas is the most effective defense against this disease

A second child with measles has died in Texas, state officials said on Sunday, in an outbreak of the childhood disease that has resulted in nearly 500 cases in Texas and has spread across 22 states. The unvaccinated school-aged child,

The health secretary has faced harsh criticism for his handling of the outbreak, embrace of alternative treatments and tepid endorsement of vaccination.

A second child in Texas has died from measles, one of the world’s most contagious illnesses, which was declared eliminated from the United States in 2000, several decades after the introduction of a highly effective vaccine.