Try to understand. It is प्राण footprint interaction. If your environment is loaded with all sort of incompatible प्राण , प्राण released by deforestation / destruction of nature, epidemics are inevitable.

Check the history. It was during world wars and post war decade when the western population was sick at mass level. Check the history of metro cities. When they were under construction, people were sick most around.

And those survive whose innate prana (as in this research some benign bacteria protects against zika) is strong.

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Research

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Benign bacteria block mosquitoes from transmitting Zika, chikungunya viruses

Benign bacteria block mosquitoes from transmitting Zika, chikungunya viruses

Wolbachia can be found in up to 60 percent of insects around the world, including butterflies and bees. While not typically found in the Aedes aegypti mosquito — the species that also transmits dengue, chikungunya and yellow fever viruses — O’Neill discovered in the early 1990s that Wolbachia could be introduced to the mosquito in the lab and would prevent the mosquitoes from transmitting dengue virus.

Zika virus belongs to the same family as dengue virus and Aliota and Osorio — with co-authors Stephen Penaido at SVM and Ivan Dario Velez, at the Universidad de Antioquia in Medellin, Colombia — asked whether Wolbachia-harboring Aedes aegypti may also be effective against Zika virus. They were also interested in studying the mechanisms behind Zika virus infection and transmission in mosquitoes.

In the study, the team infected mice with Zika virus originally isolated from a human patient and allowed mosquitoes from Medellin to feed on the mice either two or three days after they were infected. The mosquitoes were either harboring the same strain of the Wolbachia bacteria (called wMel) used in field studies or were Wolbachia-free and the mice had levels of virus in their blood similar to humans infected with Zika virus.