New Delhi, Feb. 10 -- Indian companies are bracing for a major supply shock as the rapid spread of the coronavirus infection in China has forced several factories to extend a shutdown.

Typically, factories in China slow down production from late January due to the Lunar New Year holiday period, prompting many importers to stock up in anticipation of the closures. While this has muted the immediate business impact of the coronavirus outbreak, an extended disruption could derail the best-laid plans. Already many factories, which were due to reopen on Monday, have deferred their plans to next month amid fears that workers coming in close contact will lead to a spurt in infections.

The death toll in China from coronavirus, first reported in D...