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I urge all shelters, puppy and kitten owners, to buy UVC lights. They are available, at a reasonable price, in Bangladesh, and buying one UV-C light is cheaper than the cost of treating one puppy for parvo. It is proven that they kill parvo, distemper, and other viruses. Nine out of ten puppies contract these viruses - and usually die. Vaccines - even after subsequent boosters, do not give 100 percent immunity. There is no cure for canine distemper. And even prompt parvo treatment does not guarantee survival. Simply spray the ultraviolet-C light, once a day, on dogs, cats, and where they stay - including on grass.
Puppies normally contract viruses below the age of nine months. Do not keep on all night - too much ultraviolet-C causes skin damage, eye damage, cancer and so on.
https://aerapyanimalhealth.com/why-uv/science-behind-uv/