Schedule,Time, Importance, and Side Effects
Vaccination is one of the most effective public health interventions in history, saving millions of lives every year. For babies, the first year of life is the most critical period for protection against dangerous diseases because their immune systems are still developing. This article explains what vaccines are, why they are important for infants, the recommended vaccination schedule in Tanzania and according to WHO guidelines, and the importance, indications, and side effects of each vaccine.
What is a Vaccine?
A vaccine is a medical preparation designed to train your immune system to recognize and fight specific germs (bacteria or viruses) without causing the disease itself.
Vaccines contain either:
Weakened germs (live attenuated vaccines)
Killed germs (inactivated vaccines)
Parts of germs (proteins, sugars, or genetic material)
When a baby is vaccinated, their immune system reacts by producing antibodies and "memory cells" that will recognize and fight the disease quickly if they encounter it in the future.
Why Vaccinate Babies Early?
Protection from life-threatening diseases: Newborns are vulnerable to serious infections.
Prevention of disease spread: Vaccination reduces the chance of passing germs to other children and adults.
Community immunity (herd immunity): When most people are vaccinated, even those who cannot receive vaccines (e.g., some with medical conditions) are protected.
Long-term health: Preventing illness helps babies grow and develop without interruption from avoidable diseases.
Tanzania and WHO Baby Immunization Schedule
The Expanded Programme on Immunization (EPI) in Tanzania follows WHO guidelines. Below is the schedule for the first year of life.
Baby’s Age Vaccines Given Diseases Prevented
At Birth: BCG, OPV-0 Tuberculosis, Polio
6 Weeks: OPV-1, Pentavalent-1, PCV-1, Rota-1 Polio, Diphtheria, Tetanus, Pertussis, Hepatitis B, Hib, Pneumococcal disease, Rotavirus
10 Weeks: OPV-2, Pentavalent-2, PCV-2, Rota-2 Same as above
14 Weeks: OPV-3, Pentavalent-3, PCV-3 Same as above
9 Months: MR-1 (Measles & Rubella) Measles, Rubella
18 Months: (in some programs) MR-2 (booster) Measles, Rubella
Detailed Explanation of Each Vaccine
1. At Birth
BCG (Bacillus Calmette-Guérin)
Importance: Protects against severe tuberculosis forms, especially TB meningitis in children.
Indication: All newborns in TB-prevalent countries like Tanzania.
Side Effects: Small swelling at the injection site that forms a scar; rarely, swollen lymph nodes or abscess.
OPV-0 (Oral Polio Vaccine – dose 0)
Importance: Gives early protection against polio, a disease that can cause lifelong paralysis.
Indication: All newborns.
Side Effects: Very rare; mild diarrhea in some cases.
2. At 6, 10, and 14 Weeks
OPV-1, OPV-2, OPV-3
Importance: Builds immunity against poliomyelitis in stages.
Side Effects: Rare; mild diarrhea or irritability.
Pentavalent-1, 2, 3
(Protects against Diphtheria, Tetanus, Pertussis, Hepatitis B, Haemophilus influenzae type b)
Importance:
Diphtheria: Prevents throat membrane that blocks breathing.
Tetanus: Prevents fatal muscle spasms.
Pertussis: Prevents whooping cough that can cause pneumonia or brain damage.
Hepatitis B: Prevents chronic liver infection and cancer.
Hib: Prevents meningitis and pneumonia.
Side Effects: Mild fever, swelling or redness at injection site, irritability; rare allergic reaction.
PCV-1, PCV-2, PCV-3 (Pneumococcal Conjugate Vaccine)
Importance: Prevents pneumococcal infections like pneumonia, meningitis, and ear infections.
Side Effects: Mild fever, swelling, irritability; rare severe allergy.
Rota-1, Rota-2 (Rotavirus Vaccine)
Importance: Prevents severe diarrhea and dehydration caused by rotavirus.
Indication: Oral drops given before 8 months.
Side Effects: Mild diarrhea; very rare bowel blockage (intussusception).
3. At 9 Months
MR-1 (Measles & Rubella)
Importance:
Measles: Prevents fever, rash, pneumonia, and brain damage.
Rubella: Prevents congenital rubella syndrome in unborn babies of infected mothers.
Side Effects: Mild fever, rash, swelling at injection site; rare allergic reaction or febrile seizure.
General Guidelines for Parents and Caregivers
1. Keep the Clinic Card Safe: It records all vaccinations; never lose it.
2. Don’t Skip Doses: If a dose is missed, catch-up vaccination is possible; no need to restart the series.
3. Expect Mild Side Effects: Fever, soreness, and mild swelling are normal and go away in 1–2 days.
4. Seek Medical Help If: The baby develops high fever, difficulty breathing, persistent crying, or convulsions after vaccination.
5. Maintain Hygiene After Oral Vaccines: Wash hands after diaper changes as the virus may be shed for a short time.
6. Trust the Process: All vaccines in the schedule are safe, effective, and approved by the Ministry of Health and WHO.
Myths vs Facts
Myth: Vaccines cause the diseases they are meant to prevent.
Fact: Vaccines contain weakened or killed germs and cannot cause the disease.
Myth: Natural infection is better for immunity.
Fact: Natural infection can cause severe complications or death; vaccines give safe immunity.
Myth: Vaccines cause autism.
Fact: No scientific evidence supports this claim.
Conclusion
Vaccination is not just a personal choice , it’s a responsibility to protect your child and the community. Following the baby immunization schedule ensures your child gets the best possible start in life, free from preventable diseases. The side effects are generally mild and temporary, while the benefits last a lifetime. Always consult your healthcare provider for guidance and ensure vaccines are given on time.
If you’re a parent or caregiver in Tanzania, follow the EPI schedule strictly, keep the clinic card updated, and encourage others in your community to vaccinate their children. This simple act saves lives and strengthens our collective fight against dangerous diseases.