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BK virus

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152: 119:. If symptoms do appear, they tend to be mild: respiratory infection or fever. These are known as primary BK infections. Although without any clinical symptoms, footprints of BK virus have been detected in specimens from females affected by spontaneous abortion. Serum antibodies against BK virus have also been found in spontaneous abortion affected women as well as in women who underwent voluntary interruption of pregnancy. 45: 458:
had clearance or a progressive reduction in viral load and a stabilization or improvement of graft function (7). In a study conducted by Teschner et al. in 2009, 12/13 patients who had their MMF exchanged with leflunomide cleared the virus by 109 days. In a case series, there was improvement or stabilization in 23/26 patients with BKVAN after switching MMF to leflunomide.
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The virus then disseminates to the kidneys and urinary tract where it persists for the life of the individual. It is thought that up to 80% of the population contains a latent form of this virus, which remains latent until the body undergoes some form of immunosuppression. Typically, this is in the
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in BKVAN comes from its combined immunosuppressive and antiviral properties. Two studies consisting of 26 and 17 patients who developed BKVAN on a three-drug regimen of tacrolimus, MMF, and steroids had their MMF replaced with leflunomide 20–60 mg daily. 84 and 88% of patients, respectively
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It is not known how this virus is transmitted, except that it spreads from person to person, and not from an animal source. It has been suggested that this virus may be transmitted through respiratory fluids or urine, since infected individuals periodically excrete virus in the urine. A survey of
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BK viremia load > 185 000 copies/ml at the time of first positive BKV diagnosis – to be the strongest predictor for BKVAN (97% specificity and 75% sensitivity). In addition the BKV peak viral loads in blood reaching 223 000 copies/ml at any time was found to be predictive for BKVAN (91%
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or multi-organ transplantation. Presentation in these immunocompromised individuals is much more severe. Clinical manifestations include renal dysfunction (seen by a progressive rise in serum creatinine), and an abnormal urinalysis revealing renal tubular cells and inflammatory cells.
325:. From 1–10% of renal transplant patients progress to BK virus associated nephropathy (BKVAN) and up to 80% of these patients lose their grafts. The onset of nephritis can occur as early as several days post-transplant to as late as 5 years. 420:
Single center study showed renal allografts were preserved in 8/8 individuals managed with reduction in immunosuppression while graft loss occurred in 8/12 patients treated with an increase in therapy for what was thought to be organ
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One study of 21 patients found that low levels (< 40 μg/ml) and high levels (> 40 μg/ml) had similar effects on the rate of viral clearance. Those with higher levels had more adverse events (hematologic,
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In the Teschner study, low drug concentrations were associated with decrease in viral load. This makes it difficult to determine whether or not reduction of viral load or addition of leflunomide was the cause for viral
514:(JCV), since their genomes share 75% sequence similarity. Both of these viruses can be identified and differentiated from each other by carrying out serological tests using specific antibodies or by using a 465:
Study of 26 and 17 patients were dosed between 20 mg/day and 60 mg/day with trough levels of 50—100 μg/ml. Failure was seen in patients with leflunomide plasma levels < 40 μg/ml.
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The BK virus rarely causes disease but is typically associated with patients who have had a kidney transplant; many people who are infected with this virus are
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There are no dosing guidelines for leflunomide in BKVAN. Patient to patient variability has made dosing and monitoring of leflunomide extremely difficult.
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The BK virus was first isolated in 1971 from the urine of a renal transplant patient, initials B.K. The BK virus is similar to another virus called the
1408: 2336: 77: 391:(MMF). Studies have not shown any correlation between BKVAN and a single immunosuppressive agent but rather the overall immunosuppressive load. 1222: 107:. BK virus is an abbreviation of the name of the first patient, from whom the virus was isolated in 1971 (the patient was then 29 years old). 1273: 1501: 1027: 99:
family. Past infection with the BK virus is widespread, but significant consequences of infection are uncommon, with the exception of the
1558: 850:"The impact of surveillance and rapid reduction in immunosuppression to control BK virus-related graft injury in kidney transplantation" 938:
Gardner SD, Field AM, Coleman DV, Hulme B (June 1971). "New human papovavirus (B.K.) isolated from urine after renal transplantation".
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In the study by Teschner et al., dosages and drug concentration showed no correlation with substantial variation from person to person.
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Elfadawy, NS; Flechner, SM; Xiaobo, L; Schold, J; Tian, D; Srinivas, TR; Poggio, E; Fatica, R; Avery, R; Mosaad, SB (2013).
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Some cyclosporine trough levels reported to be reduced to 100–150 ng/ml and tacrolimus levels reduced to 3–5 ng/ml
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Retrospective analysis of 67 patients concluded graft survival was similar between reduction and discontinuation of agents.
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Tagliapietra A, Rotondo JC, Bononi I, Mazzoni E, Magagnoli F, Maritati M, Contini C, Vesce F, Tognon M, Martini F (2019).
1667: 1661: 1572: 1566: 1456: 2030: 1956: 1950: 1623: 1112:"Current recommendations for diagnosis and management of polyoma BK virus nephropathy in renal transplant recipients" 379:
The cornerstone of therapy is reduction in immunosuppression. A recent surge in BKVAN correlates with use of potent
2377: 492: 434: 371:, in addition to carrying out a biopsy in the kidneys. PCR techniques are often carried out to identify the virus. 489:: Ciprofloxacin (Cipro) was shown to significantly lower viral loads but no data on survival and graft loss exist. 2087: 1694: 515: 2314: 1796: 1708: 1613: 1443: 1416: 1388: 1321: 1207: 992: 889:
Bista, BR; Ishwad, C; Wadowsky, RM; Manna, P; Randhawa, PS; Gupta, G; Adhikari, M; Tyagi, R; Gasper, G (2007).
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showing a polyomavirus infected cell – large (blue) cell below-center-left. Urine cytology specimen.
1653: 1374: 668:"Footprints of BK and JC polyomaviruses in specimens from females affected by spontaneous abortion" 611:"Footprints of BK and JC polyomaviruses in specimens from females affected by spontaneous abortion" 554:"Footprints of BK and JC polyomaviruses in specimens from females affected by spontaneous abortion" 532: 1756: 1512: 1098: 754: 705: 648: 591: 271: 56: 1258: 445:
is now generally accepted as the second treatment option behind reduction of immunosuppression.
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No guidelines or drug levels and doses exist for proper reduction of immunosuppressants in BKVAN
2354: 891:"Development of a Loop-Mediated Isothermal Amplification Assay for Rapid Detection of BK Virus" 2323: 2220: 2171: 2152: 2133: 1923: 1919: 1915: 1911: 1828: 1733: 1437: 1315: 1133: 1090: 1056: 1003: 955: 920: 871: 830: 795: 746: 697: 640: 583: 329: 104: 72: 321:
has the side-effect of allowing the virus to replicate within the graft, a disease called BK
2195: 1905: 1585: 1517: 1398: 1329: 1237: 1123: 1080: 1046: 947: 910: 902: 861: 822: 785: 774:"Prevalence of polyomavirus BK and JC infection and replication in 400 healthy blood donors" 736: 687: 679: 630: 622: 573: 565: 314: 302: 100: 2119: 2047: 2042: 2024: 1944: 1933: 1804: 1768: 1688: 1474: 1335: 1232: 1202: 1197: 1192: 1187: 725:"Low incidence of BK virus nephropathy after simultaneous kidney pancreas transplantation" 495:(IVIG) has use in the treatment of infection and allograft rejection – hard to distinguish 438: 212: 1355: 915: 890: 236: 224: 951: 813:
Fishman, J. A. (2002). "BK Virus Nephropathy – Polyomavirus Adding Insult to Injury".
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Tagliapietra A, Rotondo JC, Bononi I, Mazzoni E, Magagnoli F, Maritati M (2019).
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Tagliapietra A, Rotondo JC, Bononi I, Mazzoni E, Magagnoli F, Maritati M (2019).
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This virus can be diagnosed by a BKV blood test or a urine test for
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Gupta G, Shapiro R, Thai N, Randhawa PS, Vats A (August 2006).
1483: 67:") but the inclusion body reveals its viral pathophysiology. 59:. The high nuclear to cytoplasmic ratio makes it resemble 974: 2283: 2234: 2210: 2118: 2041: 1996: 1985: 1814: 1776: 1755: 1723: 1678: 1632: 1511: 1500: 1473: 1300: 978: 772:Egli A; Infanti L; Dumoulin A; et al. (2009). 301:was reported as showing that 82% were positive for 71: 37: 1033:Reploeg MD, Storch GA, Clifford DB (July 2001). 1274: 1160: 8: 1110:Blanckaert K, De Vriese AS (December 2006). 501:has limited data and is highly nephrotoxic. 409:Overall reduction of immunosuppressive load 2271: 1993: 1773: 1538:Progressive multifocal leukoencephalopathy 1508: 1281: 1267: 1259: 1167: 1153: 1145: 975: 135: 34: 1409:Extranodal NK/T-cell lymphoma, nasal type 1127: 1084: 1050: 914: 865: 789: 740: 691: 634: 577: 406:Replacement of tacrolimus by cyclosporine 355: 340:recipients it is notable as a cause for 544: 55:of a polyomavirus infected cell, using 1223:Trichodysplasia spinulosa polyomavirus 7: 1559:Subacute sclerosing panencephalitis 348:specificity and 88% sensitivity) . 1079:(Suppl 10): 89–91. November 2004. 425:Other therapeutic options include 25: 1878:Severe acute respiratory syndrome 1404:Follicular dendritic cell sarcoma 1028:MicrobiologyBytes: Polyomaviruses 742:10.1097/01.tp.0000228899.05501.a7 27:Member of the polyomavirus family 1864:Middle East respiratory syndrome 1086:10.1111/j.1600-6135.2004.00730.x 895:Journal of Clinical Microbiology 150: 43: 815:New England Journal of Medicine 403:Withdrawal of MMF or tacrolimus 317:patients, the necessary use of 1463:Adult T-cell leukemia/lymphoma 1449:Splenic marginal zone lymphoma 443:pyrimidine synthesis inhibitor 1: 1035:"Bk virus: a clinical review" 952:10.1016/s0140-6736(71)91776-4 1668:Tropical spastic paraparesis 1573:Lymphocytic choriomeningitis 518:-based genotyping approach. 2031:Cytomegalovirus esophagitis 1951:Human parainfluenza viruses 1624:Ramsay Hunt syndrome type 2 453:The rationale behind using 328:It is also associated with 2394: 493:Intravenous immunoglobulin 1695:Cytomegalovirus retinitis 1183: 1116:Nephrol. Dial. Transplant 277: 270: 145: 138: 51: 42: 1797:Infectious mononucleosis 1614:Chandipura vesiculovirus 1444:Hepatocellular carcinoma 1389:Nasopharyngeal carcinoma 1322:Hepatocellular carcinoma 1208:Merkel cell polyomavirus 1023:Overview of the BK virus 854:Transplant International 1593:Encephalitis lethargica 1294:viral systemic diseases 1248:New Jersey polyomavirus 481:Other treatment options 381:immunosuppressant drugs 319:immunosuppressive drugs 1965:Human orthopneumovirus 1619:Herpesviral meningitis 1580:Arbovirus encephalitis 364: 338:bone marrow transplant 125:kidney transplantation 1423:Merkel-cell carcinoma 1243:Human polyomavirus 12 627:10.1093/humrep/dey375 570:10.1093/humrep/dey375 487:Quinolone antibiotics 389:mycophenolate mofetil 359: 95:, is a member of the 2315:Human polyomavirus 1 2285:Human polyomavirus 1 2068:Adenovirus infection 1532:Human polyomavirus 2 1361:Oropharyngeal cancer 1228:Human polyomavirus 9 1218:Human polyomavirus 7 1213:Human polyomavirus 6 907:10.1128/JCM.01024-06 449:Leflunomide in BKVAN 398:Most common methods: 342:hemorrhagic cystitis 263:Human polyomavirus 1 147:Virus classification 140:Human polyomavirus 1 92:Human polyomavirus 1 1654:Post-polio syndrome 1290:Infectious diseases 827:10.1056/NEJMe020076 533:Low-dose naltrexone 1787:Epstein–Barr virus 1757:Respiratory system 1394:Burkitt's lymphoma 1129:10.1093/ndt/gfl404 441:. Leflunomide, a 365: 305:against BK virus. 111:Signs and symptoms 78:Infectious disease 57:Papanicolaou stain 2378:Alphapolyomavirus 2365: 2364: 2277:Taxon identifiers 2268: 2267: 2230: 2229: 1981: 1980: 1912:Influenza virus A 1829:Human coronavirus 1719: 1718: 1709:Herpes of the eye 1256: 1255: 1073:Am. J. Transplant 1039:Clin. Infect. Dis 1018: 1017: 867:10.1111/tri.12134 684:10.1002/jcp.27490 332:and interstitial 330:ureteral stenosis 289: 288: 101:immunocompromised 83: 82: 32:Medical condition 16:(Redirected from 2385: 2358: 2357: 2345: 2344: 2332: 2331: 2319: 2318: 2317: 2304: 2303: 2302: 2272: 1994: 1989:digestive system 1906:Orthomyxoviridae 1872:SARS coronavirus 1858:MERS coronavirus 1774: 1586:Orthomyxoviridae 1509: 1475:Immune disorders 1399:Hodgkin lymphoma 1375:Kaposi's sarcoma 1283: 1276: 1269: 1260: 1238:STL polyomavirus 1169: 1162: 1155: 1146: 1141: 1131: 1106: 1088: 1064: 1054: 976: 964: 963: 946:(7712): 1253–7. 935: 929: 928: 918: 886: 880: 879: 869: 845: 839: 838: 810: 804: 803: 793: 769: 763: 762: 744: 720: 714: 713: 695: 663: 657: 656: 638: 606: 600: 599: 581: 549: 439:fluoroquinolones 315:renal transplant 250:Betapolyomavirus 155: 154: 136: 105:immunosuppressed 89:, also known as 63:(thus the name " 47: 35: 21: 2393: 2392: 2388: 2387: 2386: 2384: 2383: 2382: 2368: 2367: 2366: 2361: 2353: 2348: 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1455: 1436: 1415: 1381: 1367: 1328: 1314: 1119: 1115: 1076: 1072: 1042: 1038: 1002: 991: 943: 939: 933: 898: 894: 884: 857: 853: 843: 818: 814: 808: 781: 778:J Infect Dis 777: 767: 735:(3): 382–8. 732: 728: 718: 675: 671: 661: 618: 614: 604: 561: 557: 547: 509: 460: 452: 424: 378: 366: 346: 327: 312: 309:Risk factors 299:blood donors 297:400 healthy 295: 292:Transmission 262: 261: 249: 237: 225: 213: 201: 190:Shotokuvirae 189: 178:Monodnaviria 177: 170: 160:(unranked): 139: 121: 117:asymptomatic 114: 97:polyomavirus 91: 90: 86: 84: 29: 2309:Wikispecies 2109:Coronavirus 1850:Common cold 1762:acute viral 1745:Myocarditis 1589:(probable) 1341:Anal cancer 528:Decoy cells 455:leflunomide 427:Leflunomide 369:decoy cells 323:nephropathy 123:setting of 2236:Urogenital 2102:Astrovirus 2062:Adenovirus 1886:SARS-CoV-2 1643:Poliovirus 1518:meningitis 1069:"BK virus" 1004:DiseasesDB 672:Hum Reprod 615:Hum Reprod 558:Hum Reprod 539:References 476:clearance. 437:, and the 421:rejection. 385:tacrolimus 383:, such as 361:Micrograph 65:decoy cell 2147:RNA virus 2128:DNA virus 2120:Hepatitis 2095:Norovirus 2083:Rotavirus 2077:RNA virus 2056:DNA virus 2002:Esophagus 1930:Influenza 1816:RNA virus 1778:DNA virus 1547:RNA virus 1526:DNA virus 1432:RNA virus 1310:DNA virus 1302:Oncovirus 499:Cidofovir 469:hepatic). 431:Cidofovir 375:Treatment 352:Diagnosis 334:nephritis 257:Species: 185:Kingdom: 73:Specialty 2372:Category 2355:11459158 2294:Wikidata 2245:BK virus 2048:diarrhea 1892:COVID-19 1634:Myelitis 1138:16998219 1103:30891138 1095:15504220 1061:11418879 925:17314224 876:23763289 835:12181409 800:19434930 759:12310204 751:16906037 710:53106591 702:30590693 653:58621197 645:30590693 596:58621197 588:30590693 522:See also 512:JC virus 313:In some 283:BK virus 272:Synonyms 233:Family: 197:Phylum: 103:and the 87:BK virus 53:Cytology 38:BK virus 18:Bk virus 2342:9888794 2300:Q582873 1998:Pharynx 1502:Central 998:D027601 960:4104714 916:1865893 506:History 245:Genus: 221:Order: 209:Class: 1662:HTLV-I 1607:Rabies 1457:HTLV-I 1175:Human 1136:  1101:  1093:  1059:  958:  940:Lancet 923:  913:  874:  833:  798:  757:  749:  708:  700:  651:  643:  594:  586:  61:cancer 2350:IRMNG 2329:3MT8J 2258:Mumps 2017:Mumps 1987:Human 1417:MCPyV 1099:S2CID 1009:32797 755:S2CID 706:S2CID 649:S2CID 592:S2CID 336:. In 171:Realm 164:Virus 132:Cause 2337:GBIF 1972:hMPV 1844:OC43 1840:HKU1 1836:NL63 1832:229E 1490:AIDS 1369:KSHV 1134:PMID 1091:PMID 1057:PMID 993:MeSH 956:PMID 921:PMID 872:PMID 831:PMID 796:PMID 747:PMID 698:PMID 641:PMID 584:PMID 435:IVIG 387:and 85:The 2324:CoL 2252:MuV 2221:CBV 2196:HEV 2184:HDV 2172:HCV 2160:HAV 2153:CBV 2134:HBV 2011:MuV 1942:V, 1734:CBV 1703:HSV 1680:Eye 1567:LCV 1553:MeV 1484:HIV 1438:HCV 1383:EBV 1330:HPV 1316:HBV 1124:doi 1081:doi 1047:doi 948:doi 911:PMC 903:doi 862:doi 823:doi 819:347 786:doi 782:199 737:doi 688:hdl 680:doi 631:hdl 623:doi 574:hdl 566:doi 516:PCR 303:IgG 2374:: 2352:: 2339:: 2326:: 2311:: 2296:: 1948:: 1909:: 1903:, 1826:: 1824:IV 1601:RV 1292:– 1132:. 1120:21 1118:. 1114:. 1097:. 1089:. 1075:. 1071:. 1055:. 1043:33 1041:. 1037:. 1007:: 996:: 954:. 942:. 919:. 909:. 899:45 897:. 893:. 870:. 858:26 856:. 852:. 829:. 817:. 794:. 780:. 776:. 753:. 745:. 733:82 731:. 727:. 704:. 696:. 686:. 676:34 674:. 670:. 647:. 639:. 629:. 619:34 617:. 613:. 590:. 582:. 572:. 562:34 560:. 556:. 433:, 429:, 344:. 173:: 2203:) 2201:E 2199:( 2191:) 2189:D 2187:( 2179:) 2177:C 2175:( 2167:) 2165:A 2163:( 2141:) 2139:B 2137:( 2090:) 2086:( 2045:/ 2000:/ 1932:/ 1924:D 1922:/ 1920:C 1918:/ 1916:B 1914:/ 1901:V 1842:/ 1838:/ 1834:/ 1795:/ 1766:/ 1759:/ 1515:/ 1282:e 1275:t 1268:v 1168:e 1161:t 1154:v 1140:. 1126:: 1105:. 1083:: 1077:4 1063:. 1049:: 985:D 962:. 950:: 944:1 927:. 905:: 878:. 864:: 837:. 825:: 802:. 788:: 761:. 739:: 712:. 690:: 682:: 655:. 633:: 625:: 598:. 576:: 568:: 20:)

Index

Bk virus

Cytology
Papanicolaou stain
cancer
decoy cell
Specialty
Infectious disease
polyomavirus
immunocompromised
immunosuppressed
asymptomatic
kidney transplantation
Virus classification
Edit this classification
Virus
Monodnaviria
Shotokuvirae
Cossaviricota
Papovaviricetes
Sepolyvirales
Polyomaviridae
Betapolyomavirus
Synonyms
blood donors
IgG
renal transplant
immunosuppressive drugs
nephropathy
ureteral stenosis

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