Hi, I live in New York and recently heard that elisa tests may not detect group n and o. Is this true? If so, then how does one know if they are infected? I have been having severe vaginal ulcers/lesions in which all other stds have been rules out. Are these female symptoms? I have also had negative elisa tests done 3 and 5 months post exposure. I am very scared, please help. Do i need other types of tests done?