Arthur Firstenberg does address the fact that the flu was present long before man made EMFs were introduced. He also provides evidence that the flu has in fact gotten a lot worse since man made EMFs were introduced. I suspect you'd know that if you'd actually read what I quoted in the post you were responding to. Anyway, once more:
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Influenza Is an Electrical Disease
Suddenly and inexplicably, influenza, whose descriptions had remained consistent for thousands of years, changed its character in 1889. Flu had last seized most of England in November 1847, over half a century earlier. The last flu epidemic in the United States had raged in the winter of 1874–1875. Since ancient times, influenza had been known as a capricious, unpredictable disease, a wild animal that came from nowhere, terrorized whole populations at once without warning and without a schedule, and disappeared as suddenly and mysteriously as it had arrived, not to be seen again for years or decades. It behaved unlike any other illness, was thought not to be contagious, and received its name because its comings and goings were said to be governed by the “influence” of the stars.
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But in 1889 influenza was tamed. From that year forward it would be present always, in every part of the world. It would vanish mysteriously as before, but it could be counted on to return, at more or less the same time, the following year. And it has never been absent since.
[snip]
In 2001, Canadian astronomer Ken Tapping, together with two British Columbia physicians, were the latest scientists to confirm, yet again, that for at least the last three centuries influenza pandemics have been most likely to occur during peaks of solar magnetic activity—that is, at the height of each eleven-year sun cycle.
Such a trend is not the only aspect of this disease that has long puzzled virologists. In 1992, one of the world’s authorities on the epidemiology of influenza, R. Edgar Hope-Simpson, published a book in which he reviewed the essential known facts and pointed out that they did not support a mode of transmission by direct human-to-human contact. Hope-Simpson had been perplexed by influenza for a long time, in fact ever since he had treated its victims as a young general practitioner in Dorset, England, during the 1932–1933 epidemic—the very epidemic during which the virus that is associated with the disease in humans was first isolated. But during his 71-year career Hope-Simpson’s questions were never answered. “The sudden explosion of information about the nature of the virus and its antigenic reactions in the human host,” he wrote in 1992, had only “added to the features calling for explanation.”3
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Source:
Firstenberg, Arthur; Firstenberg, Arthur. The Invisible Rainbow (pp. 80-82). Chelsea Green Publishing. Kindle Edition.