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The new vaccination policy, which pares the number of universally recommended immunizations from 17 to 11, is modeled after the schedule used by Denmark.
The country’s confirmed measles cases have grown to 2,065, up from 2,012 last week.
Twenty people have been hospitalized, and the CDC says the true number of cases is likely much higher.
States will no longer be required to report how many children they vaccinate to the Centers for Medicare and Medicaid Services.
The US total reflects 54 new cases, as the country teeters on the brink of losing its measles elimination status.
More than 50 counties in Arkansas have logged at least one case of whooping cough.
Syphilis rates have been rising in pregnant women and babies for about a decade.
Officials don't know what caused gastrointestinal illness in 95 passengers and 9 crew on the Celebrity Eclipse in late December.
An 18-year-old welding apprentice in Louisiana represents the ninth known case of welder's anthrax in the US.
Increased human-animal interaction, driven by factors such as urbanization and deforestation, has created new opportunities for pathogens to jump species.
