WASHINGTON: Covid-19 vaccine Johnson & Johnson can cause “possible little risk” from a rare neurological reaction but potentially dangerous, said US health officials Monday.
Disease control centers and prevention said in a statement had received reports of 100 people who received Guillain-Barre syndrome, immune system disorders that could cause muscle weakness and sometimes paralysis.
That number represents a small fraction of nearly 13 million Americans who have received a one-dose vaccine.
Most of the case of side effects reported in men – aged 50 years and over – and usually about two weeks after vaccination.
CDC said he would request an outside vaccine panel to review the problem at the upcoming meeting.
J & J does not immediately respond to a comment request.
The government said the most widely used vaccine in the US, was made by Pfizer and Moderna, did not show the risk of disruption after more than 320 million doses had been given.
Guillain-Barre Syndrome occurs when the immune system mistakenly attacks several of its nerve cells, causing muscle weakness and sometimes paralysis that is usually temporary.
It is estimated that 3,000 to 6,000 people develop syndrome every year, according to the CDC.
Historically vaccine provides extensive protection with little risk but comes with occasional side effects such as other drugs and medical therapy.
Three Covid-19 vaccines used in the US each were tested on tens of thousands of people, but even such large studies could not override side effects that were very rare.
CDC and feeding food and drugs have monitored the side effects report submitted by doctors, drug makers and patients to federal vaccine security databases.
Guillain-Barre can be triggered by a number of infections, including flu, cytomegalovirus and Zika virus.
But there are rare cases where people develop day or week disorders after receiving certain vaccines.
The J & J vaccine is strongly anticipated due to formulations of one-and done and cooling easily paid.
But early, it was associated with other rare risks, from blood clotting, and the company has not been able to produce as much as expected because of the problem at the Baltimore factory that helps make shots.