In December, the US Centers for Disease Control and Prevention issued a “red alert” warning about the vaccine’s “potential for side effects,” including increased risk of brain swelling, pneumonia, ear infections and other infections.
The CDC also raised questions about the effectiveness of the vaccine, citing “data suggesting that the vaccine may not protect against all the possible side effects.”
The agency said it is currently evaluating the safety of the shot and would make a final decision on the vaccine in the next few months.
“If there is any further evidence that the shot may not be safe and effective, the CDC will act promptly to halt the production and distribution of this vaccine,” the agency said.
The US government has not yet issued a decision on whether to approve the vaccine for use in the United States.
The vaccine has been in clinical trials in the US and in Europe.
The shots were given to over 100,000 people in the last 12 months, according to a report from the European Union Health Agency.
The agency warned that the shots could cause side effects including brain swelling and ear infections.
As of December 31, only 1,817 of the doses had been tested and none showed evidence of safety.
“The vaccines have been tested extensively and are safe to administer in all of their forms,” a CDC statement said.
But the vaccine could still face serious side effects, including neurological damage and possible pneumonia.
According to the CDC, the vaccine was administered in Europe and the US to about 1,600 people.
“We do not have any evidence that this vaccine has caused any adverse reactions, but this is an ongoing investigation,” said Dr. David Marder, director of the National Institute of Allergy and Infectious Diseases, which was in charge of the study.
He said he was not aware of any cases of vaccine-related brain damage in the trial.
In January, the European Commission announced it was reviewing the safety and efficacy of the vaccines.
“A number of safety concerns have been raised about the safety profile of this immunization schedule.
We need to make sure we get all the information before making decisions,” the commission said in a statement.
The WHO has said that the vaccines contain no mercury, aluminum or other neurotoxins.
However, the agency has noted that the risks of the flu vaccine, which contains mercury, are higher than that of the shots.