Epidemiology

Professor Tim Spector also said cases had dropped by 80% since the start of January.
The epidemiologist's warning comes after Boris Johnson imposed new lockdown measures to fight a spike in cases.
The public has lost sight of the importance of restrictions, according to two experts from the UCL Institute of Epidemiology and Health Care.
London School of Hygiene & Tropical Medicine director says the policy is causing "enormous" damage.