This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'Measles vaccination compagin between 9-14 years age for elimination is - \nSelect and explain. \nA. Keep up, B. Follow up, C. Mop up, D. Catch up', 'role': 'user'}, {'content': "Answer: D \nExplanation: WHO's measles elimination strategy comprises a three part vaccination strategy, i.e. :-\n\ni)\xa0Catch-up → One-time, nationwide vaccination campaign targeting usually all children aged 9 months to 14 years regardless of history of measles disease or vaccination status.\nii) Keep-up →\xa0Routine services aimed at vaccinating more than 95% of each successive birth cohort.\niii) Follow-up → Subsequent nationwide vaccination campaign conducted every 2-4 years targeting usually all children born after catch-up campaign.\n\nThe priorties of countries persuing measles control include :-\n\n\nImprove routine vaccination coverage level to at least 90%.\nActive coverage of more than 90% in catch-up and follow-up campaigns or active coverage of more than 90% with routine second dose of measles vaccine.\nEstablish case - based surveillance with laboratory confirmation of suspected cases and virus isolation from all chains of transmission.\nConduct supplementary vaccination campaign together with administration of vitamin 'A' in high risk areas.\n\n\nIn India, measles is a major cause of morbidity and a significant contributor to childhood mortality. Prior to the immunization programme, cyclical increase in the incidence of measles were recorded every third year. With the increase in immunization coverage levels, the intervals between cyclic peaks has increased and the intensity of the peak minimized.\nEpidemic of measles occur if proportion of susceptible children is > 40%\nIf measles is introduced in a virgin community, it infects > 90% of children.\nEradication of measles requires vaccine coverage > 96%\n\nFollowing information has been added in 22nd/e of Park\n\nAt the 2010 World Health Assembly, member states endorsed the following targets to be met by 2015 as milestones towards eventual global measles eradication: - (i) Raise routine coverage with the first dose of measles vaccine to ≥ 90% nationally and ≥ 80% in every district; (2) Reduce and maintain annual measles incidence to < 5 cases per million; and (3) Reduce measles mortality by ≥ 95% in comparison with estimated level in the year 2000.", 'role': 'assistant'}]