Republicans see fentanyl and other opioids as the biggest threat to Americans’ public health, while Democrats say it's guns, according to a new Axios-Ipsos survey.

Why it matters: The Axios-Ipsos American Health Index sheds light on how our partisan divisions — and our education levels — play into the wrangling over public health policies, and how they guide the parties' political messaging.

The survey also found that Americans overwhelmingly want private health insurance companies to cover weight-loss drugs and that they support capping out-of-pocket insulin costs at $35 per month.

Nearly half of Americans — 47% — say insurers should cover transgender-related medical care. That's a deeply partisan issue: 77% of Democrats favor it; just 16% of Republicans do.

"Like everything else, public health is a tale of two Americas — one red, one blue," said Cliff Young, president of Ipsos U.S. Public Affairs. "Governments must be nimble to talk about multiple public health issues at once."