Overall, filibustering and U.S. policies seem to have hindered more than helped U.S. attempts at territorial expansion in this time period. The Gadsden Purchase was the only official territorial acquisition during the 1850s.
Acellular pertussis vaccines were introduced nation-wide in Sweden in 1996, 17 years after the withdrawal of whole-cell pertussis vaccine from the childhood immunisation schedule.he annual incidence of culture-confirmed B. pertussis was 89-150 per 100,000 before introduction of acellular pertussis vaccines and has dropped to 17-26 per 100,000. The data suggest that unimmunised infants and children who have received only one dose of pertussis vaccine were provided some protection.
Infants and Children. In the United States, all infants and children should receive 5 doses of acellular pertussis vaccine in combination with diphtheria and tetanus toxoids (DTaP) at ages 2, 4, 6, and 15â18 months and 4â6 years. An accelerated schedule of doses may be used to complete the DTaP series.