Healthcare COVID-19: Long-term immunity in doubt as UK study finds antibodies fall rapidly Updated : October 27, 2020 03:58 PM IST Antibodies are a key part of the body’s immune defences and stop viruses from getting inside the body’s cells. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.