A woman in the U.S. was infected with the new coronavirus after receiving two doses of vaccine

According to Fox News, a woman in Texas, USA, tested positive for the virus two weeks after receiving the second dose of the new crown pneumonia vaccine. This is also known as a "vaccine breakthrough case."

Paige Crain, a teacher in Austin, Texas, said that she received a second dose of Moderna's new crown vaccine at the end of February and felt a great relaxation in her body and mind. Of course, because there is also a 2-year-old son in the family who is at high risk of disease, she still continues to follow the public epidemic prevention requirements.

Unfortunately, two weeks after the second vaccination, Crain developed mild cold-like symptoms and tested positive for the new coronavirus, which shocked her.

Infectious disease expert Charles Lerner, a member of the New Coronary Pneumonia Working Group of the Texas Medical Association, said that it usually takes several weeks to fully build immunity through vaccines, and it will not suddenly develop sufficient immunity on one day in two weeks. Therefore, if you are infected at the time of vaccination, or the body's efficiency in building immunity is slower after vaccination, "breakthrough" cases may occur.

At the same time, this case once again confirmed that the vaccine cannot be 100% effective. Currently, the effective rate reported by Pfizer and Moderna vaccine is about 95%. This is the effective rate for preventing symptomatic infection two weeks after the second shot. The risk of infection of the vaccinated is equivalent to 1/20 of the unvaccinated population, not zero. . Of course, this case also has a positive side. It is likely to be the protective effect of the vaccine. The woman's symptoms are very mild.

At present, both Pfizer and Moderna vaccines have had breakthrough cases, but the symptoms of the infected people are usually mild, their viral load is low, and they may not be infectious; however, this has sounded the alarm for our epidemic prevention work, even if vaccinated After the vaccine, we still need to be alert to virus infection and spread.