Apple and Google released the first version of the coronavirus tracking tool to public health organizations on Wednesday. These organizations can first enter the diagnostic information of people who have tested the coronavirus, and then the system will use Bluetooth technology to find and notify contacts. Apple also released a new version of its software development kit Xcode 11.5 on Wednesday,and Google also provides SDK updates to selected developers. The two companies also said they will release sample code on Friday to help developers understand how the exposure-notification system works. The software will also support all iPhones running ios13, and 2 billion Android 6 devices. source