County announced its first confirmed cases of west nile, three at once including a 13 yearold boy in longmont. So why the sudden increase in cases . We see an uptick every year sometime in august and september. We can never predict exactly which week its going to happen, but we do know that once we see this uptick we understand up with more cases reported. Reporter the state Health Department confirmed 13 cases of west nile this year including one death last week. In colorado the generally peaks later in the summer, but the disease lasts throughout the fall. We now know the mosquitoes are infected and will be infected throughout the season. So we will not be free from west nile virus until the first marched freeze. Reporter doctors say most people who hard freeze. Reporter doctors say most people who get west nile dont experience major symptoms, but about 10 face neurological effects and a small number dies reporter a gamble for everyone because of this tiny pest, maya rodriguez, 9news