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Caracterization of the Boophilus microplus Suceptible Strain

Caracterization of the Boophilus microplus Suceptible Strain Centro Nacional de Servicios de Constatación en Salud Animal Director Subdirector Parasitología Coordinador Técnico

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Caracterization of the Boophilus microplus Suceptible Strain

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  1. Caracterization of the Boophilus microplus Suceptible Strain Centro Nacional de Servicios de Constatación en Salud Animal Director Subdirector Parasitología Coordinador Técnico Dr. Hugo Fragoso S. Dr. Fernando Parrodi L. Biol. Alejandrina Ortiz N. October 2005

  2. Test Strain Reference Strain • Porto Alegre Media Joya - México • Source 1 Received October 2003 CENAPA • Joao Martins, CPVDF, BrasilContinous propagation • > 4 years • October 2005

  3. Propagation of Media Joya sample 1st sample Field sample – 2002 LPT (DD) - LIT October 2005 CENAPA 1st. infestation G O CENAPA, 1st. Eng. Females AIT (Drummond test) 1st. (probit) LPT CENAPA 2nd passage- 2002 G 1 LPT * Every 6 months the strain is toxicologically evaluated trough LPT - Probit

  4. STANDARD ACARICIDES • Active Ingredient Compound • Coumaphos • Chlorfenvinphos • Diazinon • Flumethrin • Deltamethrin • Cypermethrin • Amitraz • October 2005

  5. FORMULED ACARICIDES • Active Ingredient • (Compound) • Coumaphos 200 ppm • Chlorfenvinphos 300 ppm • Diazinon 250 ppm • Flumethrin 30 ppm • Deltamethrin 25 ppm • Cypermethrin 200 ppm • Amitraz 200 ppm • October 2005

  6. Adult Inmersion Test (Drummond) Protocol Products: Comercial formulation Concentratión: Recommended Comercial Concentration Female ticks: Fully engorged: <24 hrs after detachment Number: 40 ticks/concentration Immersión: 1 min. in 100 ml of comercial formulation Incubatión: 45 days at 28 ± 2°C, 80-90% RH. Evaluatión: Egg laying inhibition Egg fertility (hatchability) Percentage control October 2005

  7. Larval Package Test Protocol Larvae: 7 days (maximum 14 days) Solvent: Trichloroethilen Solvent: High quality olive oil Filter paper: Whatman No. 1 - 7.5 X 8.5 cm. Impregnation: 0.67 ml. distributed on paper/ dried 12 hrs/ Concentration: 1:2 dilution Set-up: filter bags produced according FAO, transfer 100 larvae/ bag (duplicated) Incubation: 28 ±2°C, 80-90% RH, Pirethroids and phosphates incubated separately Evaluatión: Mortality counts 24 hrs p.a. October 2005

  8. Critical factors controled in LPT and AIT Make sure the susceptible strain is homogenous Use strain not older than 14 days in LPT Evaluate substance concentrations by Chromatography Personnel participating should by qualified Use lab. standard procedure October 2005

  9. Percentage control found in B. microplus Susceptible and Porto Alegre, obtained by the Drummond test. October2005

  10. Comparition of the Lethal concentrations 50 (CL50)in B. microplus; Susceptible and Porto Alegre obtained by the Stone technique. October2005

  11. Comparation of the resistance indexes in B. microplus Susceptible and Porto Alegre, obtained by the Stone technique. October2005

  12. Summary Cenapa susceptible strain is completly susceptible in LPT for all products Cenapa susceptible strain is completely susceptible in Drummond test for all products The strain is very homogeneus, using LPT to evaluate the ticks trough 12 generations (4 years) has been no modified the original pattern. Compared with POA strain, CENAPA susceptible ticks are more susceptible October 2005

  13. Comparation of the Lethal concentrations 50 (CL50)in B. microplus Susceptible obtained by the Stone technique from 2002- 2005.

  14. Probit lines of B. microplus “Media Joya” susceptible strain compared with POA strain Results with Coumaphos from 2002 to 2005. D.D. 0.2

  15. Probit lines of B. microplus “Media Joya” susceptible strain compared with POA strain Results with Deltamethrin from 2002 to 2005. D.D. 0.09

  16. DISCRIMINANT DOSIS Boophilus microplus Tick LPT STONE & HAYDOCK

  17. Draft framework for 2005-06. CENAPA, Cuernavaca, Mexico • Qualification of technical personal and laboratories • Standardization analytical procedure applying LPT in reference centers and subcenters. • a. Utilize standardized FAO procedures • b. Utilize larvae 7 to 14 days old • c. Make Probit analysis with CENAPA discriminating doses (table 1) using 0.5 dilution factor. ( Coumaphos 0.2 , • 0.1, 0.05, 0.025, 0.0125, 0.00625, 0.003125. Cypermethrin 0.5, 0.25, 0.125, 0.0625, 0.03125, 0.0015625, • 0.0078125) • d. Utilize Boophilus susceptible strain “Media Joya” • e. Carry out 10 probits per product and and determine standard deviation and variation coefficient. • f. Calculate CL50, 90 and 99 by Sigma software • 2. Evaluate substance concentrations by Chromatography • a. Utilize certified active ingredient with at least 97% purity • 3. Perform Proficiency test (ring test) • Five sample of Boophilus tick egg mass will be sent from CENAPA to the reference center and subscenters. • LPT should be conducted by every laboratory and results to be sent to CENAPA.. • CENAPA will send a written report to each lab and a summary to FAO. • October 2005

  18. TICK CAMPAIGN IN MEXICO • The National Program is suported by federal governement, state governement and cattle producers • The governement stablish the rules and the operators decide how to work. • The governement make evaluation if the state wants to have a recognition of the status • Cenapa is the Nat. Ref. Cent. • There are 4 small labs doing service to the cattle producers.

  19. Baño de Sto. Tomas Ensenada Baño de San Isidro

  20. 1983 1994 -1995 2003 - 2005 DESARROLLO DE LA RESISTENCIA EN MÉXICO

  21. Ixodicida % CCR San Alfonso Sta. Luisa Amitraz 0.020 22.80 58.41 Ethión 0.068 1.64 1.0 Dursban 0.024 92.80 99.65 Esteladon 0.030 88.36 Asuntol 0.20 24.14 21.44 Bayticol 0.030 26.61 83.69 Permetrina 0.005 8.46 0.0 Batestan 0.020 29.02 1.04 Ectogan 0.030 55.60 52.55 Garraban 0.29 55.60 95.69 Besuntol 0.03125 82.84 58.69 Porcentajes de eficacia en garrapatas B. microplus resistentes al Amitraz

  22. Resistencia en Boophilus MEXICO, Enero 2004 - Diciembre 2004

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