Opportunistic infections (OIs) are infections that occur more frequently and are more severe in individuals with weakened immune systems, including people with HIV.
Being nostalgic means to miss the past time. It seems that a real life was in the past because now in the present is different, probably things changed and we know that never is going to be the same. It leads to a nostalgic feeling.
Because the psychology of nostalgia is a relatively new field of research, there is no evidence to show whether particular generations are becoming more nostalgic. Dr Tim Wildschut, of the University of Southampton, stresses that nostalgia is a fundamental human emotion and not something that changes overnight.t matters, quite simply, because nostalgia makes us feel good. Heart sick. Once nostalgia was considered a sickness-the word derives from the Greek nostos (return) and algos (pain), suggesting suffering due to a desire to return to a place of origin.