Bryan is coming to see you for a routine STD screening. A complete history reveals that he is sexually active with his partner of 5 years. They have consistently used condoms, however he admits that the condom did break once during intercourse about 6 months ago. He is feeling healthy and considers himself fit. Other than a little flu that he had half a year ago, he has no complaints for the past year. His HIV test comes back positive. Which stage of the infection is he most likely at