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COVAX has also faced several challenges which, according to the WHO, were triggered by manufacturers prioritizing bilateral deals and many high-income countries tying up the global supply of vaccines.

Less than 3.5 percent of Africans have been vaccinated against COVID-19, which is far short of the official target of 60 percent.

"Vaccine inequity remains the Achilles' heel of our response," PAHO Director Dr. Carissa Etienne said. "A handful of companies produce all the world's supply of COVID-19 vaccines," the official added.

China is likely to achieve effective herd immunity by the end of this year with more than 80 percent of the population vaccinated, China's top epidemiologist has said.

They carried out their first extravehicular activities during the construction of the country's space station on July 4.

China's Tianwen-1 mission, consisting of an orbiter, a lander, and a rover, was launched on July 23, 2020.

Local authorities in China have ramped up mass vaccination drives to contain the latest resurgence of COVID-19 attributable to the highly contagious Delta variant.

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