A group of Northeastern states and New York City on Thursday formally announced a joint public health coalition to collaborate on evidence-based public health, including vaccines, in a direct challenge to the Trump administration's efforts to upend federal vaccine policy.

It’s the latest example of vaccine policy fracturing along party lines, as blue states seek to insulate their residents from the effects of the federal government's increasingly antagonistic stance towards vaccines.

The Northeast Public Health Collaborative comprises Connecticut, Maine, Massachusetts, New Jersey, New York, Pennsylvania, Rhode Island and New York City.

The states jointly recommended infants and toddlers between 6 and 23 months old and adults older than 19 should receive the most recent coronavirus vaccines. They said healthy children and adolescents between the ages of 2 and 18 years can get the COVID-19 vaccine if their parents want it.

The states have been working together since early this year, but representatives from state health........

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