Today is the 20th anniversary of World AIDS Day, and the North Dakota Department of Health is urging people at risk for HIV/AIDS to get tested.

More than 400 cases of HIV/AIDS have been reported in North Dakota since surveillance began in 1984.

About one-fourth of the people estimated to be HIV positive are believed to be unaware of their infections.

Denise Larson, HIV prevention coordinator for the Health Department, says World AIDS Day is a great opportunity to raise awareness.

-Associated Press