PE18.1-2 | UIP Framework and Vaccine Preventable Disease Epidemiology — Summary & Reflection

KEY TAKEAWAYS

UIP Framework and VPD Epidemiology — Key Points:

• UIP structure: India's Universal Immunization Program (1985, within NHM/RCH) targets 27 million infants/year through ANM-delivered fixed-site and outreach sessions, supported by ASHA/anganwadi demand mobilisation. The NIS 2023 covers 12 VPDs across 7 age points from birth to 5–6 years.

• NIS birth-dose vaccines: BCG + OPV-0 + HepB-0 (within 24 hours for HepB-0). At 6/10/14 weeks: pentavalent + OPV + rotavirus (+ fIPV at 6 and 14 weeks). At 9–12 months: MR + JE (endemic districts) + Vitamin A. Boosters at 16–24 months and 5–6 years.

• VPD epidemiology: Measles (R0 12–18), pertussis (R0 12–17), polio (R0 5–7), Hib meningitis, hepatitis B perinatal transmission (90% chronicity rate), rotavirus (leading cause of diarrhoeal death under 5), JE (endemic, 20–30% mortality). Knowing R0 = knowing the herd immunity threshold required.

• Herd immunity threshold: HIT = 1 − (1/R0). Measles requires 92–95%, polio ~80–85%. Below the threshold, localised clusters of susceptibles sustain outbreaks even when overall coverage seems adequate.

• Cold chain: Most vaccines 2–8°C (ILR); OPV must be stored at −15 to −25°C (deep freezer). VVM monitors cumulative heat exposure. Freeze-sensitive vaccines (DPT, Hep-B, pentavalent, fIPV) are permanently damaged by accidental freezing — use the shake test to detect.

• AEFI management: Mild reactions (local erythema/fever within 48 h) = expected, counsel and reassure. Serious AEFI (hospitalisation, disability, death) = mandatory reporting to district committee within 24 hours. Causality assessment follows WHO-CIOMS algorithm.

• Programme milestones: India polio-free since 2014. Neonatal tetanus eliminated 2015. Mission Indradhanush reduced zero-dose children. Measles elimination in progress.

REFLECT

Consider a child you encounter during your community health posting — a 14-month-old who has received only OPV-0 and BCG at birth, and nothing since. The mother says the nearest PHC is far, she had no transport, and a neighbour told her 'too many injections make children weak.'

Reflect on:
1. What specific vaccines does this child need NOW, and in what order (catch-up scheduling)?
2. What is the child's risk of measles given the herd immunity threshold, if their community coverage is 65%?
3. How would you address the neighbour's concern — what framing works for a parent who mistrusts the programme?
4. What supply-side and demand-side interventions could have prevented this child from becoming under-vaccinated in the first place?

This scenario is not hypothetical — it describes millions of children in India. Kolb's cycle asks you not just to recall facts, but to apply them to action: what would YOU do differently in your future practice to close this immunisation gap?