The Center for Vaccine Development - Mali is interested in learning if vaccinating a pregnant woman against influenza will protect her infant against this disease. The investigators know that influenza infection, the "flu", affects pregnant women and their infants in Mali. The illness known as flu is caused by a germ (virus) that is passed easily among people. The flu causes symptoms such as fever, cough, sore throat, runny nose, and body aches. Certain groups of people, such as pregnant women and infants, are at risk for having severe disease when they get the flu. Vaccination against influenza is not routinely available to pregnant women in Mali although it is recommended.

Women who wish to participate will have 5 visits to the clinic and weekly visits to the home to follow the health of the woman and her infant when it is born. The investigators will also ask permission to make weekly visits to all children under 5 years of age to follow their health as it relates to influenza infection.

This is a prospective, randomized, controlled observer-blind trial measuring the efficacy, safety and immunogenicity of TIV and the safety and immunogenicity of MCV in pregnant women and their infants up to 6 months of age. Women will be recruited in the 3rd trimester of pregnancy and vaccinated with either TIV or MCV. Safety assessments of the women will be completed 30 minutes and 1 week after vaccination, at delivery and 3 and 6 months after delivery. Safety assessments of the infants will be completed at birth and at 3 and 6 months of age. Immunogenicity assessments will include blood sampling of women immediately prior to vaccination, 4 weeks post-vaccination, at delivery and 3 and 6 months after delivery; infants will have cord blood collected at birth and peripheral blood collections at 3 and 6 months of age. Visits to ascertain the costs related to ILI and LCI will also be conducted. The majority of activities conducted in this trial are related to efficacy assessments which will continue until the newborn infant is 6 months of age. We will be conducting case detection for LCI via weekly household visits. In addition, hospital-based surveillance for meningococcal disease will be conducted to measure the efficacy of MCV.

Inclusion Criteria:

1. Women in third trimester of pregnancy (≥ 28 weeks gestational age based upon last menstrual period, ultrasound or uterine height).
2. Subject is able to understand and comply with planned study procedures.
3. Subject has provided written informed consent prior to initiation of any study procedures.
4. Subject intends to reside in the study area until her newborn infant is 6 months of age.

Exclusion Criteria:

1. Member of a household which already has a woman who is participating or has participated in this study
2. History of severe reactions following previous immunization with influenza or meningococcal vaccines
3. History of Guillain-Barré Syndrome
4. Known allergy or hypersensitivity to eggs, egg proteins, latex, diphtheria toxoid, or any other components of Vaxigrip and Menactra
5. Known chronic medical condition that in the judgment of the investigator could compromise the evaluation of the study vaccine or puts the subject at risk
6. Known active infection with human immunodeficiency virus (HIV), hepatitis B, or hepatitis C
7. Any of the following complications with the ongoing pregnancy: preterm labor (with cervical change), placental abruption, premature rupture of membranes, known major congenital anomaly, or preeclampsia.
8. Acute illness and/or an oral temperature greater than or equal to 37.8 degrees C, within 72 hours of vaccination (This may result in a temporary delay of vaccination)
9. Receipt of any other vaccine, excluding tetanus toxoid, within 2 weeks (for inactivated vaccines) or 4 weeks (for live vaccines and meningococcal A conjugate vaccine (MenAfriVac)) prior to vaccination in this study
10. Woman who intends to travel out of the study area for the 40 days after delivery
11. Receipt of immunoglobulins and/or any blood products within 30 days prior to the administration of study vaccines
12. Chronic administration (defined as more than 14 days) of immunosuppressants or other immune-modifying agents within 90 days prior to administration of study vaccines (including systemic corticosteroids, e.g. prednisone or equivalent > 0.5 mg/kg/day; topical and inhaled steroids are allowed)
13. Any condition which in the opinion of the investigator might compromise the well-being of the participant or compliance with study procedures or interfere with the evaluation of the study vaccines