(Yicai Global) Jan. 25 -- China's mainland stock markets opened mixed this morning. Covid detection firms kept to last week’s rise as China required migrant workers to furnish negative virus results before they can return home during the upcoming Chinese New Year.

The Shanghai Composite Index opened 0.04 percent lower at 3,605.36. The Shenzhen Component Index stood at 15,594.81, down 0.22 percent, and the ChiNext Price Index, which tracks growth enterprises listed in Shenzhen, climbed 0.16 percent to 3,363.60.

Guangzhou Kingmed Diagnostics Group [SHA:603882], an independent clinical laboratory providing Covid nucleic acid testing services, opened 3.99 percent higher at CNY175.15 (USD27), following 20 percent growth over the last two trading days.

Da An Gene [SHE:002030], a Guangzhou-based Covid testing kit developer, started 4.1 percent up at CNY43.88. It similarly surged 18 percent in the last two trading days.

Editor: Ben Armour