Update on Clinical Parasitology Developments
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1 Update on Clinical Parasitology Developments Dr. Claire Alexander Consultant Clinical Scientist Scottish Parasite Diagnostic and Reference Laboratory Stobhill Hospital
2 Cryptosporidium Infective oocysts in faeces Transmission routes; Water/food to human human to human animal to human Can infect over 150 species of mammals 11 Cryptosporidium species known to infect humans
3 Cryptosporidium Species suis meleagridis parvum canis andersoni cuniculus hominis tyzzeri felis ubiquitum muris
4 pig horse sheep cattle marsupial opossum skunk monkey ferret fox muskrat squirrel chipmunk bear deer mouse Cryptosporidium genotypes (60+)
5 Diarrhoea (98%) Abdominal pain (95%) Low grade fever (59%) Nausea & vomiting (65%) Clinical Symptoms Incubation period is 2-14 days Length of symptoms is 3-21 days Need as few as 9 oocysts for infection Single bowel movement can contain oocysts!!
6 What happens when a Cryptosporidium positive stool arrives at SPDRL? Concentrated DNA Extraction + Internal Control DNA Other Crypto species Multiplex PCR C.hominis C.parvum ssrrna PCR-RFLP CACCTCCCTC AGCTCCTCCG ACTACACCTC CCTCAGCTCC TCCAGTTGCA 489 CACCTCCCTC AGCTCCTCCG ACTACACCTC CCTCAGCTCC TCCAGTTGCA 925 CACCTCCCTC AGCTCCTCCG ACTACACCTC CCTCAGCTCC TCCAGTTGCA 207 CACCTTCCTC AGCTCCTCCG ACTGCACCTT CCTCAGCTCC TCCAGTTGCA 250 CACCTTCCTC AGCTCCTCCG ACTGCACCTT CCTCAGCTCC TCCAGTTGCA 293 CACCTCCCTC AGCTCCTCCG ACTGCACCTT CCTCAGCTCC TCCGACTGCA 802 CACCTCCCTC AGCTCCTCCG ACTGCACCTC CCTCAGCTCC TCCGACTGCA 922 ~~~~~~~~~~ ~~~~~~~~AC GCCcCagcTC CCTCAGCTCC TCCGACTGCA CCTCCCCCAG CTCCTCCACT CGCTCCAGCT CCTCCACCTA CTCCTGCTCC 489 CCTCCCCCAG CTCCTCCACT CGCTCCAGCT CCTCCACCTA CTCCTGCTCC 925 CCTCCCCCAG CTCCTCCACT CGCTCCA GCTCC 207 CCTCCCTCAG CTCCCCCAGT TGCACCTCCC TCAGCTCCCC CAGTTGCACC 250 CCTCCCTCAG CTCCCCCAGT TGCACCTCCC TCAGCTCCCC CAGTTGCACC 293 CCTTCCTCAG CTCCTCCAGT TGCACCTCCC TCAGCTCCCC CAGTTGCACC 802 CCTTCCTCAG CTCCTCCAGN TGCACCTCCC TCAGCTCCCC CAGTTGCACC 922 CCTTCCTCAG CTCCTCCGAC TGCACCTCCC TCAGCTCCCC CAGTTGCACC TCCACCTACT CCTGCTCCTC CACTTGCACC TCCCTCAGCT CCACCACCTG 489 TCCACCTACT CCTGCTCCTC CACTTGCACC TCCCTCAGCT CCACCACCTG 925 TCCACCTACT CCTGCTCCTC CACTTGCACC TCCCTCAGCT CCACCACCTG 207 TCCCTCAGCT CCTCCAGTTG CAC...CTCC CTCAGCTCCT CCACCACCTG 250 TCCCTCAGCT CCTCCAGTTG CAC...CTCC CTCAGCTCCT CCACCACCTG 293 TCCCTCAGCT CCCCCAGTTG CAC...CTCC CTCAGCTCCT CCACCANCTG 802 TCCCTCAGCT CCCCCAGTTG CAC...CTCC CTCAGCTCCT CCACCACCTG 922 TCCCTCAGCT CCCCCAGTTG CAC...CTCC CTCAGCTCCT CCACCACCTG Sequencing Subtyping Assay
7 Subtyping of Cryptosporidium 1) Observe oocysts 2) Speciate 3) GP60 Gene Amplification Families - Extensive sequence differences in the nonrepeat regions C.hominis families = Ia, Ib, Id-Ig C.parvum families = IIa-IIii, IIk, IIl Tandem repeats - trinucleotides TCA, TCG or TCT at the 5 end of the gene tcatcatcatcatcatcgtcatcat Subtypes differ in the number of tandem repeats
8 Reporting of Cryptosporidium Subtypes The subtype begins with the family, followed by the number of trinucleotide repeats e.g. C.hominis IbA10G2 Subtype family Ib; 10 copies of the TCA repeat; 2 copies of the TCG repeat C parvum has repeat sequences (usually one or two, ACATCA) after the serine repeats labelled R; e.g. C.parvum IIaA15G2R1 Subtype family IIa; 15 copies of TCA; 2 copy of TCG;1 copy of ACATCA Repeat
9 Scottish Crypto Ref Lab Data April 2012 present 2012 present 563 Scottish cases 176 samples referred to SPDRL C.parvum n=114 (110 between April July 96%) C.hominis n=50 (37 between Aug-Nov 74%) Mixed (C.parvum & C.hominis) n=1 Others (C.ubiquitum n=5 (Scottish Water & Grampian; C.meleagridis n=1 (Glasgow); C.cuniculus n=1 Lanarkshire) Insufficient material n=3; Unamplifiable sample n=1
10 5 potential outbreaks; 2 Lothian (?petting farm, predominant subtype C.parvum IIaA17G1R1;?swimming pool C.hominis IbA10G2) 1 Tayside (?swimming pool C.parvum IIaA15G2R1; IIaA19G1R1) 1 UK wide (?foodborne C.parvum IIaA15G2R1) 1 Borders (All C.hominis but 2 groups - IbA10G2; IaA14R3). Less common subtypes isolated; C.parvum IIgA9R1 (Glasgow) - rare C.parvum IIdA16G1 (Fife) C.parvum IIcA5G3 (Lothian)
11 Future Challenges Prevailing Cryptosporidium subtypes in Scottish human cases? Prevailing Cryptosporidium subtypes in farm animals in Scotland Moredun Institute Optimum procedures for water sampling Scottish Water, Drinking Water Inspectorate Cryptosporidium whole genome sequencing Sanger Institute Metabolomics
12 Other Developments Entamoeba species; E.histolytica E.dispar E.moshkovskii PCR assays for detection in stools & liver abscesses; real-time multiplex; PCR-RFLP approach Molecular sequencing-based assays for detection of common and unusual malaria species Molecular testing of Ancathamoeba species Rapid antigen detection of Schistosome species
13 Thanks!
Human cryptosporidiosis diagnosed in Western Australia a mixed infection with
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