Natural active immunityis adaptive immunity that develops after natural exposure to a pathogen. Examples would include the lifelong immunity that develops after recovery from a chickenpox or measles infection (
School requirements for vaccinations vary from state to state. The requirements for each state can be accessed here. Travel requirements are pretty limited. International Health Regulations mandate that the yellow fever vaccination is necessary for travel to certain countries in tropical South America and...
根据第一段的 “The only shot I received was for tetanus (破伤风) when I was two months old. After that, nothing.(我只有两个月大的时候注射过破伤风疫苗。在那之后,什么都没有)”和第二段中 “The school doctor would tell me I hadn't received any of the necessary shots to attend school....
6). Due to viral mutation frequencies and successive infection waves, multiple doses of SARS-CoV-2 vaccine may be necessary for prevention. Theoretically, the next two years could be vital for the elimination of SARS-CoV-2 through vaccination, as SARS-CoV-2 presumably would not have ...
Late for school? None of them.I'd be pulled out of class and brought to the headmaster's office.The school doctor would tell me I hadn't received any of the necessary shots to attend school.(作业交晚了? 调皮捣蛋了?上学迟到了?都不是。我会被带出教 室,被带到校长办公室。校医会告诉...
Although the negative claims behind anti-immunization stances are deceptive and discredited, some parents find it difficult to accept that vaccines are necessary and safe. Many of these reasons are due to personal or religious beliefs that have persuaded parents to bypass immunizations for their child...
答案见上24C 细节理解题,根据第一段中“The only shot I received was for tetanus when I was two months old"可知选C。 25D 细节理解题。根据第二段中的The school doctor would tell me I hadn't reccived any of the necessary shots to attend school.(校医 会告诉我,我没有接种过任何上学所必需的...
This interaction provides the necessary secondary signals to initiate an immune response and to activate and expand T cells or, alternatively, to activate b cell and antibody production cascades. Together, both humoral and cellular immune responses are engendered. Preclinical studies A proliferation of ...
Cell culture-based influenza vaccines: a necessary and indispensable investment for the future. Hum. Vaccin. Immunother. 11, 1223–1234 (2015). Article PubMed PubMed Central Google Scholar Zost, S. J. et al. Contemporary H3N2 influenza viruses have a glycosylation site that alters binding of...
根据第二段"The school doctor would tell me I hadn’t received any of the necessary shots to attend school. But the same thing occurred each time: my mom would free me from the shots and nothing would happen.(校医会告诉我,我没有打过上学所必需的预防针。但每一次都发生了同样的事情:我妈妈...