LOS ANGELES • Some products from Apple, Facebook and HP are in short supply, in a possible sign of the coronavirus outbreak's effect on the global manufacturing supply chain.

The iPad Pro tablet is seeing limited availability at stores in major cities in the United States, Australia and Europe, according to a review of Apple's website on Monday.

The 12.9-inch iPad Pro with 512 gigabytes of storage and no cellular connectivity is sold out at all Apple stores in the Los Angeles area. That model and other versions are sold out at many stores in New York City as well.

Some Apple store employees said they started noticing reduced iPad Pro inventory in the last week.

Apple has been planning to debut a new iPad Pro with upgraded cameras as early as the first half of this year, so the supply shortages could also be due to incoming models.

If that is the cause of the limited availability, the presence of the virus may still disrupt Apple's plans.

AirPods Pro earbuds and built-to-order Mac computers are also continuing to show shipping delays, and some Apple Watch Series 3 and Series 5 models are listed as unavailable to buy online.

The Watch Series 3 and in-demand AirPods Pro had been constrained even before the coronavirus. The latest iPhones and Apple's non-Pro iPads are still widely available in the US, though some locations in Europe and Australia are showing the iPhone 11 as unavailable.

A review of Facebook's online store showed the Oculus Quest virtual reality headset with 128 gigabytes of storage is "unavailable" to purchase, while the Oculus Rift S is also sold out online.

HP's website showed some Envy, Pavilion and Slim desktop computers are out of stock, as are some of the company's Sprocket mobile photo printers.

Amazon's website for its products like the Echo speaker and Kindle e-reader showed no major signs of product constraints as of Monday.

Hardware supply chains have been under pressure from Covid-19 for weeks. Factories in China were slow to reopen after the Chinese New Year break, and those that did are putting returning workers through quarantine and operating at a vastly reduced capacity.

Many Chinese cities are also imposing tight restrictions on travel, complicating logistics.

Apple recently said it would not meet its guidance for the March quarter, noting that supply shortages would "temporarily affect revenues worldwide".

The company did not respond to a request for comment on Monday.

Facebook said its Oculus Quest headset has been selling out in some regions due to high demand. But the social media giant is also preparing for virus-related disruptions.

The Rift S became unavailable in the past few days, according to website records.

"Like other companies, we're expecting some additional impact to our hardware production due to the coronavirus," Facebook said in a statement.

"We're taking precautions to ensure the safety of our employees, manufacturing partners and customers, and are monitoring the situation closely."

BLOOMBERG