The Centers for Disease Control and Prevention said that COVID-19 vaccines may not be recommended for children at first when they are already available. CDC posted this statement on its website on Wednesday.

According to the statement, most of the drugmakers developing a potential COVID-19 vaccine have only tested nonpregnant, healthy adults.

The COVID-19 vaccine trials are expected to reach children and pregnant women.

However, it is not yet clear when researchers will have sufficient data to make a recommendation on these groups. Medical experts say that it is possible that it could be allowed for limited use in the U.S. before testing children are completed.

"The groups recommended to receive the vaccines could change in the future," CDC was quoted in a CNBC report.

Pregnant Women and Children

Medical experts say that pregnant women and children are not usually on the first line to be included in the clinical trials. This is because researchers still assess safety risks of the vaccine.

AstraZeneca said that this would test its potential vaccine on children in a phase two trial. Meanwhile, Moderna said to start its clinical trials on children this year.

Despite all these plans, children in the United States were still not seen to be among the first to get a vaccine. The COVID-19 vaccine would be distributed in four phases.

In the front line of distribution would be health care workers, the elderly and people with underlying conditions.

This would be followed by essential workers, teachers, people in homeless facilities, and those in prisons. Children and young adults will soon follow.

The CDC said that there might be a limited supply of COVID-19 vaccine before the end of 2020.

Postponement in Vaccine Trials

Former director of CDC said that the postponement in clinical trials should not cause worry to the American public, as reported by a CNBC report.

Dr. Tom Frieden said that temporary halt in clinical trials is proof that drugmakers and regulators are maintaining their commitment to adhere scientific principles.

"It's kind of paradoxical, but actually it's reassuring, because we expect to see signals that may not indicate a problem and we expect to see companies stopping so they can look carefully," Frieden was quoted in a CNBC report.

Frieden added that this ensures that vaccine makers are not cutting corners on ensuring the vaccines' safety.

COVID-19 Vaccine

Johnson & Johnson earlier confirmed that its COVID-19 vaccine trial was being postponed. This was after an adverse event in a participant.

As of reporting, it is not yet known whether the participant received the vaccine or a placebo.

In addition, AstraZeneca's vaccine is still on hold in the United States after an unexplained illness was reported in a vaccine participant in United Kingdom.

Nevertheless, the U.K. regulators and other countries have allowed to continue. Medical experts claim that these trial postponements are not uncommon.

Experts added that developing vaccines usually takes years to be completed. Meanwhile, vaccine makers said that they would always follow the speed of science and will not be politically pressured.

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