Maybe more a plot to terrorize—
I am wondering if it was more of a test run to see how things spread, how far will it get and how fast etc. They will have a great source of info as the CDC will make public every case where it happened etc. It will be like having a real time test for a more deadly virus. The pieces fit; not a normal strain, more than one person thinking it looks manufacutured, highly contagious so spreading can be monitored, and if it came from Mexico, you are looking at the easiest and most likely entry point for any bio attack. This is just my opinion, and I am not a medical person by nature, but I am a thinker, and this does make sense to me.