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Image Credits
1. https://en.wikipedia.org/wiki/Antigenic_shift
2. https://reliefweb.int/map/world/world-pandemic-h1n1-2009-countries-territories-and-areas-lab-confirmed-cases-and-number-11
3. https://www.slideshare.net/lyallkamal/h1n1-swine-flu
4. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2765289/
2. https://reliefweb.int/map/world/world-pandemic-h1n1-2009-countries-territories-and-areas-lab-confirmed-cases-and-number-11
3. https://www.slideshare.net/lyallkamal/h1n1-swine-flu
4. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2765289/