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The official told a conference that his country's vaccine efficacy rates need improving. A day later, he told AP he was speaking about the effectiveness for “vaccines in the world, not particularly for China.”

Some scientists worry the possibility the coronavirus escaped from research facilities hasn't gotten enough scrutiny. Others say it appears far more likely to have emerged naturally.

The findings offer little new insight into how the virus first emerged and leave many questions unanswered, though that was as expected.

Peter Daszak of the investigative team sent to Wuhan says the farms were probably where the coronavirus first jumped from bats to another animal before infecting humans.

National security adviser Jake Sullivan says he has concerns over the data China has provided to the World Health Organization regarding the origins of the coronavirus.

The White House has "deep concerns" over how initial findings on the coronavirus were communicated and demands China make data available to investigators, national security adviser Jake Sullivan says.

The coronavirus is "very unlikely" to have started in a Chinese lab but its path from animals to humans needs further investigation, a World Health Organization team said after visiting Wuhan.

Their arrival comes more than a week after an unexpected delay prevented the scientists from entering China.

The discovery, uncovered after analyzing blood donations from nine states, strengthens evidence that the coronavirus was quietly spreading around the world before health officials were aware.

Hundreds of thousands of people in China have already received this vaccine. Now, preliminary trials are showing promising results, although it's too early to say whether it can prevent disease.