However, as the virus is mutating, attaining that 'magical zero figure' in Delhi is unlikely. New Delhi: Cases of COVID-19 might be declining steadily but as the virus is mutating, attaining that magical zero figure in Delhi is unlikely, experts have said and predicted that coronavirus will be reduced to an endemic in the future. "Zero is an unlikely figure. The virus is mutating and it is difficult to predict its future behaviour," he said. Explaining why the virus has posed such a challenge, Dr Sanjeev K. Singh, Resident Medical Director, Amrita Hospitals in Faridabad said it is an mRNA virus that keeps changing its structure.