The Wisconsin Department of Health Services is telling vaccine providers not to administer the Johnson & Johnson shot while federal health authorities investigate an extremely rare but severe blood-clotting reaction.
Providers should keep the vaccine until a federal review has been completed, DHS secretary-designee Karen Timberlake said in a Tuesday statement.
Earlier Tuesday, federal health officials recommended an immediate halt to injections of the single-dose vaccine after six people in the U.S. developed a blood-clotting condition known as cerebral venous sinus thrombosis within two weeks of being vaccinated.
One woman died and one has been hospitalized in critical condition, The New York Times reported. All six cases were women between the ages of 18 and 48.
The adverse effects "appear to be extremely rare," according to a joint statement issued by leaders at the Food and Drug Administration and Centers for Disease Control. The recommended pause was issued "out of an abundance of caution," they said.