They explained that these physical reactions indicate that the vaccine is working.
In a study published last month, researchers from the US Centers for Disease Control and Prevention analyzed the safety data of the first 13.7 million doses of the Covid-19 vaccine taken by Americans. Of the side effects reported to the agency, 79.1% were from women, although only 61.2% of the vaccines were for women.
Almost all rare allergic reactions to the Covid-19 vaccine also occur in women. The researchers reported that 19 people who had this reaction to the Moderna vaccine were women, and that of the 47 people who had an allergic reaction to the Pfizer vaccine, 44 were women.
Sabra Klein, a microbiologist and immunologist at the Bloomberg School of Public Health at Johns Hopkins University, said: “This does not surprise me at all. This gender difference is completely consistent with previous reports of other vaccines.”
In a 2013 study, scientists from the US Centers for Disease Control and Prevention (CDC) and other agencies found that after receiving the 2009 pandemic influenza vaccination, the number of women who had allergic reactions was four times that of men, despite being vaccinated There are more men with this vaccine than women. Another study found that between 1990 and 2016, women accounted for 80% of all adult vaccine allergic reactions.
Julian Ji, a medical staff member of the Office of Immunization Safety of the CDC, said that in general, women “have more responses to various vaccines,” including influenza vaccines injected by adults and some influenza vaccines injected during childhood, such as prevention of B vaccine. Vaccines for hepatitis B and measles, mumps and rubella.
However, this news is not all bad for women. Side effects are usually mild and short-lived. These physical reactions indicate that the vaccine is working. “It produces a very strong immune response, so it is likely to be protected,” said Dr. Klein.