How do I find research? I've emailed over 55 professors in my state and they have all rejected me.

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Like the title says,

I am applying for a PhD program in Microbiology, but they won't accept me unless I have research under my belt. I am 6 years out of undergrad and have no connection to grad programs or undergrad programs. I have called and emailed to no avail. Does anyone have any ideas on how I can get in a lab?