## Measles Epidemiology in India ### Correct Statement: Two-Dose UIP Schedule **Key Point:** Measles is included in the Universal Immunization Programme (UIP) with a **two-dose schedule**: first dose at 9 months and second dose at 16–24 months (as per current Indian guidelines). This two-dose approach significantly improves population immunity and reduces susceptibility in cohorts that escape the first dose. ### Notifiability Status **High-Yield:** Measles is a **notifiable disease under IDSP** (Integrated Disease Surveillance Programme) in India. It is also reportable under the Epidemic Diseases Act, 1897. Suspected and confirmed cases must be reported to district surveillance officers. ### Basic Reproduction Number (R₀) | Disease | R₀ Range | Interpretation | |---------|----------|----------------| | Measles | 12–18 | Highly contagious; requires >95% population immunity for herd protection | | Mumps | 4–7 | Moderately contagious; requires 75–86% population immunity | | Rubella | 5–7 | Moderately contagious | **Clinical Pearl:** The high R₀ of measles (12–18) explains why a single-dose strategy was insufficient and why the two-dose schedule is epidemiologically necessary to achieve and maintain herd immunity. ### Elimination Status **Key Point:** Measles **elimination has NOT been achieved** in India. Although progress has been made through the Measles-Rubella (MR) vaccination campaign launched in 2017, measles remains endemic in many regions. Continued surveillance, outbreak investigation, and vaccination campaigns are essential. ### Mnemonic: MMR Epidemiology — "R₀ Hierarchy" **M**easles: R₀ = 12–18 (highest) **M**umps: R₀ = 4–7 **R**ubella: R₀ = 5–7 [cite:Park 26e Ch 10]
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