Lorraine suspects she might have an STI. She has occasional outbreaks of blisters, but is only sexually active when the blisters go away. Which best explains why Lorraine’s behavior is unhealthy? Most likely, she has herpes and can transmit the viral infection even when the blisters are inactive. Most likely, she has herpes, which is a bacterial infection that spreads quickly, even when the blisters are inactive. Most likely, she has chlamydia, which means the blisters are not contagious but the virus is. Most likely, she has trichomoniasis, which means the blisters are not contagious but the virus is.