he told me it wasn't really on his mind. still others i talked to said they have a healthy fear. >> it is a very rare occurrence. i know there is more this year. it is just such a rare thing. there are so many other problems you are going to have on july fourth. that this shouldn't be something they are all that concerned about. i know they are very scary but they are just not that concerning to me. >> we are just hoping we don't get bit. >> reporter: are you scared at all? >> i'm not that worried. >> yeah, a healthy fear. >> even still this is pretty scary stuff. victor was talking about at least 11 attacks. that's nearly double the average for this time of year. six attacks is around the average. you may be asking yourself what is contributing to all of this? we've been interviewing experts all week on cnn. a number of factors, environment tall biological variables like