"Today the FDA and @CDCgov issued a statement on the vaccine (developed by) Johnson & Johnson # COVID19. We recommend a pause in the use of this vaccine as a precaution," says the agency on its Twitter account.

The FDA adds that "the safety of the # COVID19 vaccination is a priority for the federal government (US), and we take all reports of post-immunization health problems" against the pandemic very seriously.

The FDA and CDC announcement means that all federal health channels - mass vaccination sites, community health centers, and the like - that previously administered Johnson & Johnson's vaccine will have to stop the process for now, according to an official. federal health, reports CNN.

Agencies recommend that states do the same, but it will be up to each state to make that decision.

The pause in the administration of the vaccine occurred after detecting a type of blood clot that does not appear on the list of possible adverse side effects that were part of the emergency use authorization for J&J by the United States, local media say.

However, experts stress that these cases are rare and want healthcare providers to have time to understand what the possible side effects are and how best to treat them.

In the United States, one of the countries with the highest levels of vaccination against covid-19 in the world, in addition to the J&J vaccine, sera created by Pfizer and Moderna are administered.