Preliminary study shows shot may not prevent transmission of South African strain, or stop mild and moderate cases -- though it might curb serious cases and deaths

Ramallah also worried by delay in getting doses, with first major AstraZeneca shipment due in March and other suppliers possibly taking months more

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

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

Consortium of pharma and tech giants, including Merck, Teva, Amazon, will run new innovation lab to develop ecosystem, tap into new tech

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

Announcement comes as Palestinian Authority records 33 deaths from coronavirus in past 24 hours, the highest number since start of pandemic

Decision by pharmaceutical giant a major sign of recognition for Sputnik V, which has been viewed with skepticism by the West