Health and Fitness Large Percentage of Youth With HIV May Lack Immunity to Measles, Mumps, Rubella by Gary Kopycinski on August 13, 2015 Gary Kopycinski Author More in Health and Fitness: On Hantavirus, Park Forest Officials Urge Caution May 18, 2026 Rep. Kelly Condemns FDA Approval of Flavored E-Cigarettes May 6, 2026 Park Forest Aligns With Illinois Guidance on Childhood Vaccines Amid Federal Changes January 11, 2026 NIH study finds those vaccinated before starting modern HIV therapy may be at risk