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美国医生说,给孕妇接种疫苗能使胎儿对某些疾病产生免疫力。他们还说,这种免疫力能延续到婴儿出生后一年以上。这个发现对发展中国家可能是十分重要的,因为这些国家常难于给儿童足够的疫苗以预防疾病。疫苗通过加速体内称为抗体的物质的生成,以保护身体。抗体能抵抗引起疾病的某些病毒和细菌。
The U.S. doctor said vaccinating pregnant women can make the fetus immune to certain diseases. They also say the immunity lasts for more than a year after birth. This finding may be very important for developing countries because it is often difficult for these countries to give enough vaccine to their children to prevent the disease. Vaccines protect the body by accelerating the production of substances called antibodies in the body. Antibodies resist certain viruses and bacteria that cause the disease.