<P> Human immunodeficiency virus infection and acquired immune deficiency syndrome ( HIV / AIDS ) is a spectrum of conditions caused by infection with the human immunodeficiency virus ( HIV ) . Following initial infection , a person may not notice any symptoms or may experience a brief period of influenza - like illness . Typically , this is followed by a prolonged period with no symptoms . As the infection progresses , it interferes more with the immune system , increasing the risk of developing common infections like tuberculosis , as well as other opportunistic infections , and tumors that rarely affect people who have working immune systems . These late symptoms of infection are referred to as acquired immunodeficiency syndrome ( AIDS ) . This stage is often also associated with unintended weight loss . </P>
<P> Human immunodeficiency virus infection and acquired immune deficiency syndrome ( HIV / AIDS ) is a spectrum of conditions caused by infection with the human immunodeficiency virus ( HIV ) . Following initial infection , a person may not notice any symptoms or may experience a brief period of influenza - like illness . Typically , this is followed by a prolonged period with no symptoms . As the infection progresses , it interferes more with the immune system , increasing the risk of developing common infections like tuberculosis , as well as other opportunistic infections , and tumors that rarely affect people who have working immune systems . These late symptoms of infection are referred to as acquired immunodeficiency syndrome ( AIDS ) . This stage is often also associated with unintended weight loss . </P>
the infectious agent that causes aids is a ( n )
the infectious agent that causes aids is a ( n )
virus
virus