A new test to measure the rate of HIV infection in populations is raising hopes among health officials that they’ll be able to figure out more quickly and cheaply which methods work best to prevent the spread of HIV/AIDS.

Known as the Limiting Antigen Avidity Enzyme Immunoassay, the test to measure HIV incidence was developed by the U.S. Centers for Disease Control and Prevention.

It can tell whether a person was infected recently — within the last 141 days — or earlier.

Read more at the Wall Street Journal