Pertussis Vaccination Among HIV-infected and HIV-uninfected Pregnant Women

Inclusion Criteria: * Pregnant women age ≥18 years to \<39 years (vaccinated group only). * Gestational age 20-36 weeks documented by the approximate date of the last menstrual period and corroborated by physical or sonargraphic exam (vaccinated group only). * Documented to be HIV-infected or HIV-uninfected. * Good general maternal health. * Able to understand and comply with planned study procedures. * Able and willing to provide written informed consent for themselves and infant Exclusion Criteria: * Receipt of any live licensed vaccine ≤14 days prior to study initiation. * Any significant (in the opinion of the site investigator) acute illness. * Use of anti-cancer systemic chemotherapy or radiation therapy ≤48 weeks of study enrolment or has immunosuppression as a result of an underlying illness or treatment. * Long term use of glucocorticoids, including oral or parenteral prednisone ≥20 mg/day or equivalent for more than 2 consecutive weeks (or 2 weeks total) ≤12 weeks of study entry, or high-dose inhaled steroids (\>800 mcg/day of beclomethasone dipropionate or equivalent) ≤12 weeks before study entry (nasal and topical steroids are allowed). * Receipt of corticosteroids for preterm labour ≤14 days before study entry. * Receipt of immunoglobulin or other blood products (with exception of Rho D immune globulin) ≤12 weeks prior to enrolment in this study or is scheduled to receive immunoglobulin or other blood products (with the exception of Rho D immune globulin) duri…