The Centers for Disease Control and Prevention is looking into the death of a Virginia woman who received a single-dose Johnson & Johnson vaccine.

This probe is part of the agency's investigation into other possible "adverse side effects" from the vaccine, according to a Fox News report.

Virginia State Vaccination Coordinator Danny Avula said that the death was reported to the CDC's Vaccine Adverse Event Reporting System.

Details of the woman who died were not provided to the public.

The CDC and the Food and Drug Administration said in a joint statement that they are reviewing the unusual clots in six women between the ages of 18 and 48, according to an NBC Washington report.

Avula said the state of Virginia has stopped administering the vaccine.

"This pause is reassuring in that it demonstrates that the systems that are in place to monitor vaccine safety are working," Avula was quoted in a report.

He added that they will continue the vaccine rollout in the state with other two authorized vaccines such as Pfizer and Moderna.

READ MORE: Johnson & Johnson Vaccine Doses Delayed After a Batch Was Ruined

Blood Clot Reports

Reports of blood clots after receiving the vaccine involved women between the ages of 18 and 48. One of the six women already died.

However, it is not yet clear what factors attributed to these six women becoming sick.

Dr. George Rutherford III, an epidemiologist at the University of California, San Francisco, said that the lack of understanding is the reason why public officials need to pause the distribution.

Public officials are not yet sure when the pause would end.

However, Dr. Anne Schuchat, principal deputy director of the CDC, said involved agencies should make the recommendations right away, according to a Yahoo News report.

The White House pandemic response COVID coordinator Jeff Zients assured that there would be no significant effects of the J&J suspension on their vaccination program as the majority of vaccinations come from Pfizer and Moderna.

Meanwhile, former President Donald Trump scrutinized U.S. President Joe Biden for allowing the pause.

Dr. Paul Offit of the Children's Hospital of Philadelphia, a pioneer of vaccine science, said the decision is the right move as the blood clot is a rare but serious side effect.

Johnson & Johnson Lab Contamination

Earlier this month, another 62 million J&J vaccine doses may be contaminated, according to reports.

This was in the same Baltimore factory that already ruined 15 million doses of the vaccine, according to a Business Insider report.

If found that the 62 million doses were contaminated, they would have to be disposed of.

However, the factor assured that none of those doses have been used as it has not been certified by regulators to distribute the said doses to the public.

The plant is managed by Emergent BioSolutions, which is a manufacturing partner to both J&J and AstraZeneca.

Federal authorities said that the incident is a human error.

Meanwhile, federal officials say they expect to have enough doses from J&J and two other vaccines to meet the vaccination commitment.

Pfizer is shipping doses ahead of schedule, while Moderna is ramping up their delivery with up to 15 doses, instead of 10.

READ NEXT: Johnson & Johnson's Single-Dose COVID-19 Vaccine Shows Signs of Promise

WATCH:  FDA calls to pause Johnson & Johnson vaccines over rare blood clots: CNBC After Hours - from CNBC Television