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What is Disease which shows cyclical trend:- and explain in detail?
Time Distribution of Disease: - Periodic fluctuations: 1. Cyclical Trend - Fluctuations in every few years Ex - Measles, Rubella, Influenza Measles every 2-3 years Rubella every 5-8 years Influenza show maximum cyclical trends d/t antigenic shift/drift 2. Seasonal Trend - Disease that increases every paicular season Ex - Malaria/Dengue in Rainy Season, I in winter Season 3. Epidemic Trend - Sho term fluctuations Ex-Food poisoning, Bhopal Gas tragedy 4. Secular Trend - Long term fluctuations Ex - Non-communicable disease ( CHD, HTN etc)