Apple analyst Ming-Chi Kuo has lowered his iPhone shipment forecast by 10 percent to 36-40 million units in the first quarter of 2020, noting that the Wuhan coronavirus outbreak is affecting iPhone supply in China.

For example, multiple reports have indicated that assembly of the rumored "iPhone 9" or "iPhone SE 2" could be disrupted. The lower-cost device, expected to be a revamped version of the iPhone 8, was rumored to enter mass production in February ahead of a March release. Apple could still announce the device in March, but initial supply could be limited until production can ramp up.

In his research note with TF International Securities, seen by MacRumors, Kuo added that smartphone shipments in the Chinese market declined by 50-60 percent year-over-year during the Chinese New Year holiday period, possibly due to declining consumer confidence in the country stemming from the coronavirus outbreak.

Out of an abundance of caution, Apple said it has closed all of its corporate offices, stores, and contact centers in mainland China through at least February 9 due to the coronavirus outbreak.

Earlier this week, the World Health Organization declared the Wuhan coronavirus outbreak a global public health emergency. More information about the virus and how to protect yourself is available on its website.