Respected news magazine Spiegel described the trial as a "witch hunt" and AIDS organisations expressed their concern that HIV carriers would feel pressured to take sole responsibility for safe sex.
"We are concerned about the result of the trial because it risks sending the message that you shouldn't get screened for the HIV virus because if you don't know, you're not liable," said Volker Mertens, spokesman for the German AIDS help association.
"The trial could also give the impression that an HIV carrier has a greater responsibility whereas we believe everyone should assume responsibility when it comes to sexual relations, for example by insisting on condom use," he added.
Lisa Power, policy director of the Terrence Higgins Trust, a well-known British AIDS charity, said Benaissa's age at the time of the first alleged incident should also be considered.
"It's a hell of a diagnosis to get at the age of 17. How many of us at the age of 17 haven't made a daft decision about our sexual and emotional life?" she said.
"I think there are some real issues about someone who was that young, and that confused."
The case also sparked intense media interest because the half-Moroccan singer shot to fame in 2000 thanks to a television talent show and went on to score a string of hits in central Europe.
No Angels split up in 2003, but reformed in 2007 and competed in the 2008 Eurovision Song Contest, coming 23rd out of 25 countries.
Source-Medindia