Pertussis Vaccine in Healthy Pregnant Women

Inclusion Criteria: Pregnant subjects must meet all inclusion criteria in order to be eligible to participate in the study. * 18 - 45 years of age * In the 30th-32nd week of a pregnancy at low risk for complications as determined by the Obstetrical Risk Assessment Form \[ORAF\] and the following criteria: All Pregnant Women: * Second trimester or later ultrasound with no significant abnormalities. * Alpha fetal protein (AFP) testing, one of the following: 1. Normal maternal serum AFP performed at 15-20 weeks' gestation (either as part of the quad screen or separately) 2. Abnormal maternal serum AFP at 15-20 weeks' gestation followed by an amniocentesis demonstrating no chromosomal abnormalities AND either normal amniotic fluid AFP or normal amniotic fluid acetylcholinesterase (AChE) levels. 3. If a serum AFP test is not performed, one of the following: i. A level II ultrasound with no significant abnormalities ii. A normal amniotic fluid AFP test AND an amniocentesis demonstrating no chromosomal abnormalities must be documented. Pregnant Women 40-45 years of age: no chromosomal abnormalities identified by diagnostic testing \[chorionic villus sampling (CVS) or amniocentesis\]. * Pregnant Women 18-39 years of age: at least one of the following: 1. Level II ultrasound with no significant abnormalities 2. No chromosomal abnormalities identified by diagnostic testing (CVS or amniocentesis) 3. Pregnancy estimated to be at low risk (\< 1 in 270) for Down's syndrome (trisomy 21), trisomy 13 and trisomy 18 by appropriate first or second trimester screening test. Appropriate screening test includes any one of the following: i. first trimester screening (nuchal translucency measurement, pregnancy-associated plasma protein A (PAPP-A), and beta- human chorionic gonadotropin (B-hCG) ii. first trimester screening and second trimester quad screen, with risk estimated using an integrated, sequential, or contingency approach iii. second trimester quad screen alone * Intend to be available for follow-up visits and phone call access through 13 months following delivery * Willing to have infant immunized with Pentacel vaccine at 2, 4, 6, and 12 months of age * Willing to give written informed consent Non-pregnant subjects must meet all inclusion criteria in order to be eligible to participate in the study. * 18-39 years of age or 40-45 years of age * Intend to be available for a follow-up visit and phone call access through 6 months following receipt of Adacel vaccine * Willing to give written informed consent * Must fulfill one of the following: (i) she is not able to bear children because she has been surgically sterilized (tubal ligation, bilateral oophorectomy or hysterectomy) for at least one year or is at least 1 year post-menopausal or (ii) she agrees to practice effective methods of contraception including, but not limited to, abstinence, monogamous relationship with vasectomized partner, barrier methods, birth control pills, patches or hormonal shots or hormonal implants, NuvaRing and IUDs (intrauterine devices), during the study period between enrollment and 30 days following receipt of the vaccine. (If subject is of childbearing potential, the method of birth control will be documented.) * For a female subject of childbearing potential, must have a negative pregnancy test (urine or serum) within 24 hours prior to vaccination Exclusion Criteria: Pregnant subjects who meet any exclusion criteria at baseline will be excluded from the study. * Serious underlying medical condition (e.g., immunosuppressive disease or therapy, human immunodeficiency virus (HIV) infection, collagen vascular disease, diabetes mellitus, chronic hypertension, moderate to severe asthma, lung/heart disease, liver/kidney disease, chronic or recurrent infections). * Significant mental illness (e.g. schizophrenia, psychosis, major depression). * Currently smoking or using illegal substances. * History of a febrile illness (greater than or equal to 100.4 degrees Fahrenheit or 38 degrees Celsius) within the past 72 hours for antepartum injection or febrile illness (greater than or equal to 100.4 degrees Fahrenheit or 38 degrees Celsius) within 24 hours for postpartum injection. * Previous severe reaction to any vaccine. * Receipt of tetanus-diphtheria toxoid immunization within the past 2 years. * Receipt of tetanus toxoid, reduced diphtheria toxoid and acellular pertussis vaccine absorbed (Tdap) immunization ever. * Receipt of a vaccine (excluding influenza), blood product (excluding Rhogam) or experimental medicine within the 4 weeks prior to antepartum injection through 4 weeks following post-partum injection. However, measles-mumps-rubella vaccine is permitted post-partum. * Receipt of or plans to receive influenza vaccine within the 2 weeks prior to or following antepartum injection. * Deemed high risk for serious obstetrical complication as determined by the Obstetrical Risk Assessment Form. * Anything in the opinion of the investigator that would prevent volunteers from completing the study or put the volunteer at risk. Non-pregnant subjects who meet any exclusion criteria at baseline will be excluded from the study. * Serious underlying medical condition (e.g., immunosuppressive disease or therapy, HIV infection, collagen vascular disease, diabetes mellitus, chronic hypertension, moderate to severe asthma, lung/heart disease, liver/kidney disease, chronic or recurrent infections). * Significant mental illness (e.g. schizophrenia, psychosis, major depression). * Currently smoking or using illegal substances. * History of a febrile illness (greater than or equal to 100.4 degrees Fahrenheit or 38 degrees Celsius) within the past 24 hours. * Previous severe reaction to any vaccine. * Receipt of tetanus-diphtheria toxoid immunization within the past 2 years. * Receipt of Tdap immunization ever. * Receipt of or plans to receive an investigational or licensed vaccine (excluding influenza), blood product or experimental medicine within the 4 weeks prior to Adacel vaccination through 4 weeks following Adacel vaccination * Receipt of or plans to receive influenza vaccine within the 2 weeks prior to or following Adacel vaccination. * Intends to become pregnant during the study period between enrollment and 30 days following receipt of the vaccine. * Anything in the opinion of the investigator that would prevent a volunteer from completing the study or put the volunteer at risk.