I have had nasal sores on the entrances to my nostrils intermittently for the past 2-3 years and I cant seem to get rid of them. These usually come on when I have sinus drainage and/or am ill with a cold or the flu , but they can also occur when I am not ill. It was cultured a year and a half ago and was positive only for Citrobacter koseri. I dont know how I got this and I have taken antiobiotics to try to get rid of it, but I am allergic to Sulfa, which is what the sensitivity test recommended. I have also been trying to conceive and am wondering if this C. koseri could be a reason I am having multiple early miscarriages/chemical pregnancies since it is harmful to unborn babies.