darkfire2017oxd5un

08.09.2020 08:54

Английский язык

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Use the correct form of the verb (active or passive). слова, которые нужно изменить, в скобках. in 1796, british physician edward jenner (1) (inoculate) a young boy with the smallpox (оспа) virus and (2) (show) that the boy then (3) (become) immune to the smallpox virus. the success of his experiment at a time when many (4) (die) of smallpox, (5) (celebrate) as a miracle. this approach, called vaccination or immunisation, then (6) (become) the subject of major scientific and clinical research. immunisation (7) (be) now an important part of preventive medicine, especially in offering protection from diseases for which there are as yet no effective treatments. vaccines are available against many viral and bacterial diseases. due to the current aids (acquired immune deficiency syndrome) crisis, scientists (8) increasingly (look) toward vaccination as a means against it. viruses (9) (present) a special challenge to medical treatment. traditional vaccines (10) (consist) of either the weakened or the heat-killed virus proteins. while such vaccines (11) (be) quite successful against some infections, they fail to cope with others. the problems in traditional immunisation (12) (sparkled) interest in new and improved vaccine models. researchers now can insert a gene from a pathogen (возбудитель инфекции) into a piece of dna. when this (13) (inject) into tissues, a protein that (14) (stimulate) an immune response (15) (produce). this immune response is unique and in some ways superior to that produced by traditional vaccines.