Acute HIV infection may present in many ways – sometimes as a serious illness
aidsmap.com, May 2015 - "A Swiss study of people who were diagnosed during early HIV infection has found that a quarter of them presented or developed a wide variety of non-typical early symptoms of HIV infection, many of them serious and a few life-threatening.
Gastrointestinal and neurological symptoms were particularly common in these manifestations of recent HIV infection. However, although these symptoms were often misdiagnosed at first, they did not, in this study at least, significantly delay the diagnosis of HIV infection.
The Zurich Primary HIV Infection Study is an observational study that, since January 2002, has documented symptoms and laboratory results in any patient who is diagnosed with early HIV infection."