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Nobody is eager to be stuck by a needle twice, so naturally many would view a COVID-19 vaccine that provides disease protection after a single injection as a good thing.

Two new studies released today suggest that might be possible.

Both studies involved rhesus macaque monkeys. In 

injected either with a vaccine candidate or an inert placebo. Six weeks after they were vaccinated, the researchers exposed the animals to the coronavirus, both by putting it in their noses and down their throats.

All 20 of the animals receiving the inert, placebo injection showed signs of infection in both their lungs and noses after being exposed to the virus. But one of the vaccine candidates seemed quite effective in preventing infection. In the six animals vaccinated with this particular candidate, none had signs of infection in their lungs, and only one had a sign of infection in the nose. 

This is the candidate Janssen's parent company, Johnson & Johnson has decided to start testing in humans. Initial trials started this week.

. It uses a harmless virus to transfer genetic material from the coronavirus into the person being vaccinated. It's an approach the company has been using for years. 

"We have now vaccinated 80,000 people with the vector in different diseases," says Paul Stoffels the chief scientific officer of Johnson & Johnson. And it's known to be safe. 

, researchers at the National Institute of Allergy and Infectious Diseases tested another viral vector vaccine, this one developed by the University of Oxford. Some animals receive a single vaccination, some received two. As in the other study, researcher challenged the monkeys with virus and waited to see what happened.

None of the vaccinated monkeys developed disease, but all of them still showed signs of active infection in their upper airway. 

As of July 1, approximately 8,000 human volunteers had participated in a study of the Oxford vaccine. If it is shown to prevent disease in humans, that of course would be a good thing. But if it doesn't prevent infection of the upper airway, it means a vaccinated person could still spread the disease.

 published earlier this week, also involving macaques, suggested a vaccine being developed by the National Institutes of Health and the biotech company Moderna also evidence that it could prevent COVID-19.

, professor of medicine and epidemiology at Emory University School of Medicine, of the studies in macaques. "But at the end of the day, it's only animal models." 

He says only when the human trials have results will we know for sure any of the vaccines being tested will actually work. 

Science

Health

COVID-19

Joe Palca

Author

Studies COVID-19 vaccine candidates in monkeys show promise of an effective vaccine, but it will take large scale human trials to know for sure if they work. 

Vaccine candidate delivers protection in a single shot (in monkeys)

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