they then examined this structure in light of natural antibody development to ascertain the steps that would be needed to elicit a vrc01-like antibody through vaccination.
之后他们按照自然界抗体发展规律得出与vrc01相似的抗体是如何一步一步通过免疫产生。
h1n1 is the new variant for which there is no natural antibody within human body. it is infected through sneeze, cough, and physical contact and the young & strong people are more susceptible.