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Another central figure - former US Ambassador to Ukraine Marie Yovanovitch - is due to testify on Friday in the second public hearing in the inquiry.

Another mask maker, Chengdu Xinjin Shifeng Medical Apparatus &Instrument, said the company can now make 100,000 masks every day.

Antibiotics have long been used to kill harmful bacteria in both animals and people. But the continued overuse of the drugs has led to the serious problem of resistance. The European Union decided in 2006 to eliminate antibiotic growth promoters from animal feed and China has announced that it will follow suit starting from next year.

Another region that would be hit is the MaerkischerKreis region in western Germany, where there are many export-oriented small and medium-sized firms.

Antibody tests will eventually become a key tool for tracking infection rates and help researchers develop a COVID-19 vaccine. But scientists haven't determined which antibody neutralizes the virus.