The earliest of signs is fever. Given that running a fever is no big deal this sign goes unnoticed. Who in the world would expect to have been infected by the world’s deadliest STD just because they had a fever. Well yes, not many of us. HIV happens to be this scary because it is incurable till date, and eventually causes death of the infected. If you have it you have it for life, which is not very long as it will soon demolish your immune system. Having no immune system means even a mild cough could prove fatal.