The science has never been better, but political will has reached a new low: AIDS experts warned Monday that the fight against HIV was in real danger as funding fell by a fifth last year.

A major international AIDS conference got underway in Rio de Janeiro for the first time since the United States began to dramatically slash foreign aid following U.S. President Donald Trump¡¯s return to the White House last year.

European nations including France, Germany and the U.K. followed suit.