Google's Verily Debug project has applied for an EPA Experimental Use Permit to release male Culex quinquefasciatus mosquitoes infected with Wolbachia bacteria in California and Florida. The approach aims to suppress populations that transmit West Nile virus and St. Louis encephalitis without chemicals or genetic modification. Release totals remain disputed between 32 million and 64 million insects over two years, with the public comment period ending June 5.