Federal well being officers are investigating “a handful” of recent, unconfirmed studies which have emerged after Johnson & Johnson injections were paused nationwide, to find out whether or not they may be circumstances of a uncommon, severe blood clotting dysfunction that prompted the pause, the director of the Facilities for Illness Management and Prevention stated Monday. It is unclear as yet whether the vaccine was responsible for the unique few circumstances.

“Proper now, we’re inspired that it hasn’t been an awesome variety of circumstances however we’re trying and seeing what has are available,” the director, Dr. Rochelle Walensky, stated at a White Home information convention on the pandemic.

Final week, federal well being officers stated they needed vaccine recipients and medical suppliers to concentrate on the unique circumstances and to report any incidents of great opposed reactions to the photographs. Well being officers known as for the pause after six ladies ages 18 to 48 developed the blood clotting dysfunction inside about one to a few weeks after Johnson & Johnson injections. One died, and as of final week, a second remained hospitalized in essential situation.

On Wednesday, two extra circumstances had been added to the record: a seventh girl, and a person who participated in Johnson & Johnson’s medical trial. Seven of the eight recipients had blood clots within the mind. The clotting dysfunction appeared to be mixed with low ranges of platelets, blood cells that sometimes stop clotting. The circumstances had been reported both to the C.D.C.’s database or on to Johnson & Johnson.

Dr. Walensky stated Monday that officers are pursuing the more moderen studies “and verifying whether or not they do in reality replicate a real case.”

In a follow-up assertion, the C.D.C. stated: “Right now, no further circumstances of the uncommon type of blood clots post-vaccination with the Johnson & Johnson vaccine have been confirmed.” If any new circumstances are confirmed, the company stated it could current that knowledge to a C.D.C. advisory committee that’s scheduled to satisfy on Friday.

The committee’s consultants might suggest lifting the pause, modifying it or limiting using the vaccine.

Dr. Anthony S. Fauci, a White Home medical adviser, stated on the NBC program “Meet the Press” on Sunday that he seriously doubts the vaccine will be permanently pulled. However he stated, “I do assume that there’ll possible be some kind of warning or restriction or danger evaluation.”

Consultants are attempting to find out whether or not the uncommon blood clotting dysfunction is in reality linked to the Johnson & Johnson vaccine. The investigation follows actions by European regulators who concluded that one other vaccine — developed by AstraZeneca and based mostly on an analogous know-how — could also be linked to a uncommon clotting dysfunction.