St. Louis Encephalitis (SLE). St. Louis Encephalitis (SLE) is transmitted from birds to man and other mammals by infected mosquitoes (mainly some Culex species). SLE is found throughout the United States, but most often along the Gulf of Mexico, especially Florida.Major SLE epidemics occurred in Florida in 1959, 1961, 1962, 1977, and 1990.t. Louis Encephalitis (SLE). St. Louis Encephalitis (SLE) is transmitted from birds to man and other mammals by infected mosquitoes (mainly some Culex species). SLE is found throughout the United States, but most often along the Gulf of Mexico, especially Florida.
Seven Years. Keep any tax return and documentation that includes a claim for deducting worthless securities for seven years. There you have it. Check back in a few days and I'll share a few more tips on what to keep indefinitely and how to keep your records organized and safe.
Tax Records. 1  Tax Returns (Federal and State) â Keep copies of your tax returns and all supporting records until the time that the IRS can examine your return has expired. 2  Generally speaking, that falls between 3 and 7 years from the date you filed, depending on your return. We recommend you keep copies of the actual returns indefinitely, including copies of checks made out to the government (IRS or state). 2  Pay stubs-Keep until you get the year end summary. 3  Then keep the summary and shred the pay stubs.