Charlotte’s hospitals have issued new visitor restrictions amid a spike in flu cases. That means children 12 and under are not permitted to visit at Carolinas HealthCare System and Novant Health hospitals in the Charlotte region as of 7 a.m. Friday. Individuals of all ages experiencing flu-like symptoms — runny nose, sore throat, fever and cough — are also encouraged not to visit. “The flu virus can be extremely dangerous to people who have compromised immune systems, cancer, kidney disease…