Summer may decide fate of leading shots in vaccine race

People on six continents already are getting jabs in the arm as the race for a COVID-19 vaccine enters a defining summer, with even bigger studies poised to prove if any shot really works—and maybe offer a reality check.

Already British and Chinese researchers are chasing the coronavirus beyond their borders, testing potential vaccines in Brazil and the United Arab Emirates because there are too few new infections at home to get clear answers.

The U.S. is set to open the largest trials—30,000 people to test a government-created shot starting in July, followed about a month later with another 30,000 expected to test a British one.

Those likely will be divided among Americans and volunteers in other countries such as Brazil or South Africa, Dr. Anthony Fauci of the National Institutes of Health told The Associated Press.

While he’s optimistic, “we’ve been burned before,” Fauci cautioned.

Multiple successes, in multiple parts of the world, are vital.

“This isn’t a race of who gets there first. This is, get as many approved, safe and effective vaccines as you possibly can,” Fauci said.

Vaccine experts say it’s time to set public expectations. Many scientists don’t expect a coronavirus vaccine to be nearly as protective as the measles shot.

If the best COVID-19 vaccine is only 50% effective, “that’s still to me a great vaccine,” said Dr. Drew Weissman of the University of Pennsylvania.

“We need to start having this conversation now,” so people won’t be surprised, he added.

And for all the government promises of…

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