India is witnessing over two lakh cases for the last four days. In the mean, there are reports that a person once gets infected and found negative after treatment and again getting infected again. Dr Randeep Guleria, director of AIIMS, says that those who got infected 6 to 7 months ago and are now getting infected again, then we must examine that whether their immunity was reduced in this span of time or it is because of mutants in the virus. Watch video.