re: Why hasn't a viral pandemic originated from India?

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The word cholera is from Greek: ?????a kholera from ???? khole "bile". Cholera likely has its origins in the Indian subcontinent as evidenced by its prevalence in the region for centuries.[14]
The disease appears in the European literature as early as 1642, from the Dutch physician Jakob de Bondt's description it in his De Medicina Indorum.[71] (The "Indorum" of the title refers to the East Indies. He also gave first European descriptions of other diseases.)
Early outbreaks in the Indian subcontinent are believed to have been the result of poor living conditions as well as the presence of pools of still water, both of which provide ideal conditions for cholera to thrive.[72] The disease first spread by trade routes (land and sea) to Russia in 1817, later to the rest of Europe, and from Europe to North America and the rest of the world,[14] (hence the name "Asiatic cholera"[1]). Seven cholera pandemics have occurred in the past 200 years, with the seventh pandemic originating in Indonesia in 1961.[73]
The first cholera pandemic occurred in the Bengal region of India, near Calcutta starting in 1817 through 1824. The disease dispersed from India to Southeast Asia, the Middle East, Europe, and Eastern Africa.[74] The movement of British Army and Navy ships and personnel is believed to have contributed to the range of the pandemic, since the ships carried people with the disease to the shores of the Indian Ocean, from Africa to Indonesia, and north to China and Japan.[75] The second pandemic lasted from 1826 to 1837 and particularly affected North America and Europe due to the result of advancements in transportation and global trade, and increased human migration, including soldiers.[76] The third pandemic erupted in 1846, persisted until 1860, extended to North Africa, and reached South America, for the first time specifically affecting Brazil. The fourth pandemic lasted from 1863 to 1875 spread from India to Naples and Spain. The fifth pandemic was from 1881–1896 and started in India and spread to Europe, Asia, and South America. The sixth pandemic started 1899–1923. These epidemics were less fatal due to a greater understanding of the cholera bacteria. Egypt, the Arabian peninsula, Persia, India, and the Philippines were hit hardest during these epidemics, while other areas, like Germany in 1892 and Naples from 1910–1911, also experienced severe outbreaks. The seventh pandemic originated in 1961 in Indonesia and is marked by the emergence of a new strain, nicknamed El Tor, which still persists (as of 2018[77]) in developing countries.[78]

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In 1357, people for the first time called an epidemic in Florence, Italy influenza di freddo, which translates to “cold influence,” referring to the disease’s possible cause.

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Most influenza viruses that infect humans seem to originate in parts of Asia, where close contact between livestock and people creates a hospitable environment for mutation and transmission of viruses.

*The 1580 pandemic began in Asia during the summer, and then spread to Africa and Europe.
*In 1781, another pandemic struck. It arose in China, spread to Russia, Europe and North America over the next year
*The pandemic of 1830–1833 began in China, and then spread to the Philippines, India Indonesia, across Russia and Europe
*1957 Asian flu (caused by H2N2), which killed 1.1 million people worldwide
*Hong Kong flu of 1968 (H3N2), which killed 1 million people worldwide

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