First, it was a critical shortage of shipping containers due to the pandemic. Then came a massive blockage in the Suez Canal.

Now, businesses and consumers are bracing for yet another shipping crisis, as a virus outbreak in southern China disrupts port services and delays deliveries, driving up costs again.

The Chinese province of Guangdong has faced a sudden surge in Covid-19 cases. Authorities have moved to shut down districts and businesses to prevent the virus from spreading rapidly.

That's causing massive shipping delays in major Chinese ports, and jacking up already-high shipping costs as waiting times at berth "skyrocketed," according to analysts and those in the shipping industry. 

"The disruptions in Shenzhen and Guangzhou are absolutely massive. Alone, they would have an unprecedented supply chain impact," said Brian Glick, founder and CEO at supply chain integration platform Chain.io, told CNBC.

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