Top immunologists on how the mass inoculation drive has taken on fresh urgency as new strains spread globally

Cheap, easier to store shot boosts virus-fighting arsenal; Britain records 54,990 daily COVID-19 cases and 454 virus-related deaths on Sunday

Emergency authorization given for British shot amid demands for greater transparency over inoculation developed by Indian company Bharat Biotech

Experts criticize British policy, which also reportedly includes directive allowing healthcare workers to mix Pfizer-BioNTech and AstraZeneca inoculations

Developed by British-Swedish drugmaker and University of Oxford, shots can be stored in a regular refrigerator making them an easy option for many countries

Following criticism over initial trial, pharma giant's CEO believes general efficacy will be equal to Pfizer-BioNTech, Moderna; says data will be published 'at some point'

Antibody treatment could be used to reduce deaths in nursing homes if immediately deployed upon discovery of infection; 10 people injected so far upon exposure to pathogen

While fatigue, headaches and muscle pain can be expected, clinical trials have shown that more serious reactions to inoculations are few and far between