South Africa said Thursday it will now provide free treatment to all people infected with HIV, regardless of the condition of their immune system. The country leads the world in infections. Before the announcement by the country’s health department, people were eligible for free treatment based on a certain measure of their white blood cells, which fight infection. […] The change is based on World Health Organization guidelines adopted in late 2015 after it was found that treating those with HIV as early as possible improves their health and prolongs their life. …