 Hello, I am Dr. Bhaskarshan A. Head of the Department of Pediatrics and Chief of Division of Pediatric Infectious Diseases at Manipal Hospital, Bangalore. Of course, natural immunity is always better. But the thing is, in the natural immunity, the child will suffer from the disease and then it will get the immunity and here, short of suffering, the child will get immunity. For example, in chicken pox, by vaccinating, we can avoid the child contacting the chicken pox. But if the child gets chicken pox, the child will get a lifelong immunity. But in the process, the child will suffer for 10 to 15 days with a lot of rashes, itching, fever and once the child gets out of it, it will get some scars and that will take few more weeks to months to clear it. And few of them can have some complications also. Chicken pox, though the grandmother says that it comes and goes, nothing will happen. But we have seen the worst complications of chicken pox. For example, if the virus can travel into the brain and cause encephalitis, it can affect the hindbrain of the child and cause what is called as cerebellitis and it can affect the liver, it can affect the kidney, it can affect the heart and lungs and any of the major organs it can affect and cause complications. We cannot predict which child is going to develop the complications. But here by vaccinating, you can avoid these complications also. So in a natural immunity, child will suffer and then get the immunity at the end of it and there is a risk of getting complications. In vaccination, short of suffering, the child will get immunity without suffering. That is the difference.