Are mono-like symptoms first, or is mononucleosis itself a symptom?
Mononucleosis is an infection marked by a number of symptoms, such as sore throat, fever, and swollen lymph nodes. New (acute) HIV infections can look very much like mono, because the two infections can cause the same kinds of symptoms. I hope that untangles it for you.
You should know: The answer above provides general health information that is not intended to replace medical advice or treatment recommendations from a qualified health care professional.