It didn't have to be the Chinese. It could have been done on purpose by anyone who developed SARS or by anyone who was supplied with SARS or by anyone (e.g., an employee) who stole it from the developer or from someone else who had possession of it. All possibilities should be considered.
The NEXT big outbreak - canned SARS by Del Monte, after that it will be Frozen Desert SARS by Marie Calendar, just in time for Thanksgiving we'll have Gently smoked Honey-SARS and over Christmas everone can enjoy Fruitcake SARS and merrily and promptly forward that on to someone they 'care' for ...