Whooping cough is a highly infectious disease of the gas exchange system, caused by the bacterium Bordetella pertussis. Which method provides protection to infants against whooping cough and reduces the chance of developing this disease later?
1 )
a short course of more than one type of antibiotic
2 )
a six-month course of one type of antibiotic
3 )
injections of antibodies specific to Bordetella pertussis
injections of antigens from Bordetella pertussis bacteria
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