A 2003 study found that fluid intake could decrease the severity of immune response in people with dengue fever.
Our COVID vaccine experience during the past six months By the time the Pfizer and Moderna COVID vaccines were approved for emergency use in the United States in December 2020, "we already knew the short-term side effects very well from the efficacy studies," Goepfert said.
Almost all of these cases occurred in the eight weeks after a person received the vaccine.