Volunteers at Pfizer's new crown vaccine clinical trial have had side effects.

Side effects include fatigue, headaches, chills and muscle pain, the company said.
of the volunteers in the trial also developed fever symptoms, including high fever.
because the data came from a double-blind experiment, Pfizer didn't know which volunteers were using vaccines or placebos.
, head of vaccine research and development at Pfizer, said the independent data monitoring committee "has access to blind data, so they will notify us if there is any safety risk."
but has not done so far".
Pfizer has reportedly recruited 44,000 volunteers for the new crown vaccine, developed in cooperation with German vaccine maker BioNtech, and 29,000 people have taken part in the trial.
, Pfizer executives said on an investor conference call that more than 12,000 volunteers had been given a second dose of the vaccine.
Follows news on September 8th, local time, that AstraZeneca had voluntarily suspended a Phase III clinical trial of the new crown vaccine AZD1222 at dozens of clinical trial centres in the US due to suspected serious adverse reactions in a UK clinical trial participant.
is the world's first suspended phase III clinical trial of the new crown vaccine.
However, at 14:20 BST on 12 September, AstraZeneca announced on its official website that clinical trials of the new crown vaccine AZD1222 had resumed in the UK after safety confirmation by the UK Medicines and Healthcare Products Regulatory Authority (MHRA).
, however, clinical trials in other countries have not yet resumed and AstraZeneta will continue to work with health authorities around the world to recover in due course under guidance.
content Source: China News Network, Xinkangjie.