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Dismissing such claims as groundless, they said the standard vaccines are only for treating bacterial lung infections, and provide no protection against the new virus.

Doctor Chen Jingyu (right) operates on a pneumoconiosis patient at the China-Japan Friendship Hospital in Beijing in February.[Photo by Zhu Xingxin/China Daily]

Despite the rising revenue, costs associated with package delivery make it a difficult business for the Post Office to run profitably.

Dockless shared bicycles, high-speed trains, mobile payment and e-commerce have earned a reputation as China's "four great new inventions" in modern times.

Didi first launched operations in Toluca, a city located 60 kilometers west of Mexico City, in April and has expanded to Guadalajara and Monterrey.