There are at least 35 vaccines in clinical trials around the world, nine of which are in Phase 3, the final stage of testing.
Charlotte Summers, lecturer in intensive care medicine at Cambridge University, welcomed the resumption of the Oxford trial and said the researchers had shown their commitment "to putting safety at the heart of their development program".
Over 18,000 individuals globally have reportedly received study vaccines as part of the trial.
"We are reviewing the situation and pausing India trials till Astrazeneca restarts them", the Serum Institute of India tweeted on Thursday.
After days of uncertainty following a safety alert in the global trials for one of the frontrunners in the Covid-19 vaccine race, AstraZeneca on Saturday said it is resuming human testing in the United Kingdom of the vaccine candidate it developed jointly with Oxford University.
Trials for the AstraZeneca vaccine on 5,000 volunteers in Brazil are well advanced and have not produced any problems in participants, according to the immunobiology center of Sao Paulo's Federal University, which is running the trials.
The candidate vaccine was developed by the University of Oxford along with AstraZeneca. The trials also assess effectiveness by tracking who gets sick and who doesn't between patients getting the vaccine and those receiving a dummy shot.
"To tackle the global COVID-19 pandemic, we need to develop vaccines and therapies that people feel comfortable using, therefore it is vital to maintaining public trust that we stick to the evidence and do not draw conclusions before information is available", she said.
Egypt's Health and Population Ministry announced that starting Sunday it would open volunteer registration for the third phase of the coronavirus vaccine clinical trials, done in cooperation with the Chinese government and the UAE health care company G42. The document said that after an independent review, "these illnesses were either considered unlikely to be associated with the vaccine or there was insufficient evidence to say for certain that the illnesses were or were not related to the vaccine".
Italy, which was ground zero for Europe's outbreak, is one of the main countries investing in the AstraZeneca vaccine.
Nicole Winfield in Rome contributed.