During the 10 months of pregnancy, pregnant women will inevitably encounter situations where they need to be vaccinated. Not all vaccines can be vaccinated during this special period of pregnancy. Some precautions are harmful to the fetus and may even cause fetal malformation. But it would be wrong to reject all vaccinations because of this. Some vaccines not only prevent illness in pregnant women but also protect the fetus. Why such disparate results? This depends on the nature of the vaccine.
There are currently two types of vaccines: live attenuated vaccines and killed vaccines. Live attenuated vaccines refer to pathogens that undergo various treatments to mutate and become less virulent. Inoculation into the body will not cause disease, but pathogens can grow and multiply in the body, triggering the body\’s immune response and achieving long-term or lifelong protection. Although live attenuated vaccines are attenuated, they are still live pathogens. It can enter the fetus through the placenta and grow and reproduce in the fetus. A fetus\’s immune system is not exactly the same as an adult\’s. Therefore, it cannot be said to be absolutely safe for the fetus. Pregnant women should not use these vaccines. Rubella vaccine, measles vaccine, and hepatitis A vaccine are all such vaccines and are contraindicated by pregnant women. Inactivated vaccines are processed dead pathogenic bacteria that use their antigenicity to induce an immune response in the body and produce protective antibodies. Since inactivated vaccines cannot grow and reproduce in the body, the immunity produced by one injection is short, and multiple injections are needed to obtain long-term protection. This type of vaccine will not affect the fetus after vaccination, and pregnant women can safely receive it when needed. Hepatitis B vaccine, diphtheria-tetanus pertussis vaccine, and Japanese encephalitis vaccine are all such vaccines.