America:-17 Dec 20 The first known allergic reaction to the Pfizer Inc. Covid-19 vaccine in the U.S. was reported in Alaska as some snarls began to emerge in the effort to send the shots across the country, highlighting the daunting challenges ahead for a historic immunization drive. A health-care worker in Juneau, Alaska, with no history of allergies experienced flushing and shortness of breath 10 minutes after receiving a shot, the state health department said in a statement Wednesday.
