There are at least 500 coronaviruses. We must develop next-gen vaccines now, experts say.

In some ways, we've been lucky with the COVID-19 pandemic.

The virus that causes it is highly contagious but not as lethal as others in its coronavirus family. The initial SARS virus killed roughly 1 in 10 of those infected; a relative called Middle East respiratory syndrome, or MERS, still kills 1 in 3.

But we may not always be so lucky. With animals, including bats, colonized by hundreds of coronaviruses, another one might come along with the infectivity of SARS-CoV-2 and the death rate of MERS.

Hoping to prevent that, scientists on Tuesday unveiled a "road map" for developing a new vaccine that would be broadly protective against all coronaviruses.

If given ahead of time, such a vaccine could ideally avoid a future pandemic from this kind of virus, said Michael Osterholm, who directs the Center for Infectious Disease Research and Policy at the University of Minnesota, which is helping lead the effort.

"Can we achieve that? We don't know," he said. "We won't know until we try."

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