This is a coincidence i was just thinking about this myself today. In the end i decided although this would be a great way of spreading a virus it would be very obvious. Rainwater is tested all the time at various weather stations. Also i think this would work TO well. It might be a good idea as chemical warfare but not as a sneaky way to infect a population

I am sure they have tested this, but whether its responsible for h1n1 is another matter.

Like above said, rain water is probably tested all the time, and they would be probably found out, but it must of happened in the past though.

Nice find though, and you never know. But i think h1n1 was released in mexico, on purpose by the americans, and we see that the highest concentraion was there and only there.