title: Vaccination at the portal of entry of infectious agents.
mesh_terms: D000281:Administration, Intranasal; D000284:Administration, Oral; D000328:Adult; D002648:Child; D002675:Child, Preschool; D006506:Hepatitis A / Q000517:prevention & control; D006561:Herpes Simplex / Q000517:prevention & control; D006801:Humans; D007223:Infant; D007251:Influenza, Human / Q000517:prevention & control; D008585:Meningitis, Meningococcal / Q000517:prevention & control; D009175:Mycoplasma Infections / Q000517:prevention & control; D011135:Polysaccharides, Bacterial / Q000627:therapeutic use; D012141:Respiratory Tract Infections / Q000453:epidemiology / Q000517:prevention & control; D014481:United States; D014611:Vaccination / Q000379:methods*; D014612:Vaccines / Q000008:administration & dosage; D014777:Virus Diseases / Q000517:prevention & control
chemical_list: D011135:Polysaccharides, Bacterial; D014612:Vaccines