Dead Chicken

Recently people can hardly buy live chickens in the Chinese market due to the serious bird flu which can spread easily in the days before summer comes. There are many kinds of bird flu viruses, such as H5N1、H7N1、H7N2、H7N3、H7N7、H9N2 and H7N9, among them all H5N1 and H7N9 are the two of the most dangerous for humans and unfortunately these two virus had/have caused death. The goverment had/have taken steps to prevent people from these threatening viruses, since live chickens started to decrease and will  disappear in the Chinese market in the end. However, maybe we can kill all the chickens in the markets, but we can not kill the all the birds flying in the vast sky, too. Only by producing the relative vaccine can we stop these dangerous virus threating us. So I think we should pay more attention to solve the problem rather than simply protect from these virus.