Why can’t we remove OE from nature once and for all?

Why can’t we remove OE from nature once and for all? Ophryocystis elektroscirrha is here to stay?

OE spores Monarch butterfly Ophryocystis elektroscirrha

OE spores Monarch butterfly
Ophryocystis elektroscirrha

There are several reasons:
1) it is estimated that at least 1/3 of Monarchs in the US have OE to one degree or another
2) all Monarchs in the Miami/Dade area are considered infected with OE
3) most likely nearly all Monarchs in Mexico are infected with OE
4) the parasite is found in many countries and several continents and islands
5) Queens in the US and Mexico (at least) are infected with OE
6) OE will transmit from one species to another
7) OE has been found in 3 Danaus species and suspected to be in more
8) Millions of Monarchs from the Eastern US, Eastern Canada, and some from the Western US migrate to Mexico, intermingling with each other during winter months. Many are OE infected. When they begin to mate in the spring, one without OE will often mate with one with OE. This will transfer spores to the outside of the uninfected butterfly where they can be transferred to milkweed leaves, another Monarch, and milkweed leaves. (Cross-transfer causes few problems compared to direct infection.)

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