Des Moines Register Iowa COVID vaccine providers should stop giving patients the one-dose Johnson & Johnson formula while federal officials study "extremely rare" adverse effects possibly related to it, the Iowa Department of Public Health announced Tuesday morning. "The Iowa Department of Public Health (IDPH) has advised that all Iowa vaccine providers pause administration of the Johnson & Johnson COVID-19 vaccine until more details are confirmed," the health department's statement said. The state's announcement came hours after officials with the U.S. Centers for Disease Control and Prevention and the U.S. Food and Drug Administration urged vaccine administrators to halt its use. The drug is associated with six instances of women between the ages of 18 and 48 developing a severe type of blood clot six to 13 days after their vaccinations.