It’s the rarest cause of acute kidney failure . This problem can be reversed, unless the obstruction is very long enough to cause damage to kidney tissue present. Obstruction of 1 or both ureters could be caused by the following: Kidney stone, only on one side usually Cancers of the urinary system organs, kidney tumor or cancer, or structures near the urinary tract that may obstruct the outflow of urine Medications Obstruction at the bladder level can be caused by the following: Bladder stone Enlarged prostate Blood clot Bladder cancer Neurologic disorders of the bladder impairing its capability to contract Treatment includes relieving the obstruction. After the blockage is removed, the kidneys usually recover in 1 to 2 2 weeks if there is no kidney illness or other problem..Furthermore, since nymphal deer ticks are small in size , it is not uncommon because of their bites to stay undetected. Reviews of elderly and immunocompromised patients being at a larger risk for serious encephalitis due to West Nile virus are well documented.24,25 Our immunohistochemical research with recently generated deer tick virus antibodies demonstrated prominent labeling of neuronal-cell bodies and their procedures; a focus of apparent oligodendroglial illness was also identified . In addition, some neurons contained rounded granular-to-tubular profiles. A segmental distribution of immunolabeling was evident in the hippocampus, as was seen in cerebellum infected by central European tickborne encephalitis virus, as explained previously.26 The parenchymal lymphocytic infiltrates in this full case and in previous pathological studies of tickborne encephalitis virus26, 27 were CD8+ cytotoxic T cells predominantly, which were also observed in close apposition to surviving neurons, further indicating that immunologic mechanisms may possess contributed to nerve-cell destruction in tickborne encephalitides.