The Centers for Disease Control and Prevention are issuing a warning to anyone who's had the single-shot Johnson & Johnson COVID-19 vaccine within the last month.

CNN reports that if you experience a major headache that refuses to go away, significant leg pain, or abdominal pain, that will not lessen, or severe shortness of breath, the CDC strongly recommends that you contact your doctor right away.

If you've been following the news, you're aware that across the country on Tuesday, April 13, Johnson & Johnson coronavirus vaccine injections came to a halt after health agencies called for a pause in the use of the vaccine as they examine a rare blood-clotting disorder. The disorder was found in six recipients, all female.

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The six women were between the ages of 18 and 48 and all six developed the condition within one to three weeks of being vaccinated. One woman in Nebraska has been hospitalized in critical condition, while another in Virginia, has died.

According to health officials, the Virginia woman, 45, developed symptoms six days after she was inoculated and died six days after that. The medical term for the condition is cerebral venous sinus thrombosis(CVST).

Basically, it's a very rare but severe type of blood clot that develops in an area of the brain. It's so rare, that out of the over 7 million people in the United States who have received the Johnson & Johnson vaccine, only six cases have been reported.

Johnson & Johnson recently said in a statement:

The safety and well-being of the people who use our products is our number one priority. We have been working closely with medical experts and health authorities, and we strongly support the open communication of this information to healthcare professionals and the public.

According to Dr. Anne Schuchat, principal deputy director of the US Centers for Disease Control and Prevention, if you received the Johnson & Johnson more than a month ago, the risk is "very low".

For much more information, check out the full story on CNN's website here.

LOOK: Answers to 30 common COVID-19 vaccine questions

While much is still unknown about the coronavirus and the future, what is known is that the currently available vaccines have gone through all three trial phases and are safe and effective. It will be necessary for as many Americans as possible to be vaccinated in order to finally return to some level of pre-pandemic normalcy, and hopefully these 30 answers provided here will help readers get vaccinated as soon they are able.