Presentation on theme: "Bloodborne Pathogens and the Dental Health Care Worker"— Presentation transcript:
1Bloodborne Pathogens and the Dental Health Care Worker Module 12Bloodborne Pathogens and the Dental Health Care Worker
2Bloodborne Pathogens and the Dental Health Care Worker Christine Wisnom, RN, BSNurse EducatorDental SchoolUniversity of Maryland BaltimoreHelene Bednarsh, RDH, MPHDirector, HIV Dental Ombudsperson ProgramBoston Public Health CommissionKathy Eklund, RDH, MPHThe Forsyth InstituteBoston, Massachusetts
3Updated Postexposure Protocols for HBV, HCV, HIV & Special Circumstances MMWR, CDC, 6-01,Vol. 50,RR-11HIVHepatitis CHepatitis BPregnancyDelayed exposure reportUnknown donor exposureSource patient drug resistantHuman bite protocols
5Objectives-Prevention Prevention is best strategy to avoid infectionPrevent HBV infection by HBV vaccinePrevent HBV transmission by HBV PEPPrevent HIV infection by timely HIV PEPPrevent injury through utilization of “safe sharps”, auto-recapping devices
7Objectives- PlanningPlanning prior to occupational exposure is the key to efficient implementation of post-exposure protocolsEstablish a protocol for occupational exposuresEducate health care workers regarding the implementation of the plan during job orientation and ongoing job training.CDC, MMWR , Vol.50/No. RR-11, 16.
8Objectives- Identification Identify:Potential risk factors for transmission of HIV, HBV and HCVHealth Care Professional (HCP) for medical follow-upVarious recommendations for PEP based upon type of exposure for each
9Objectives- Implementation Implement :Methods of risk reduction based on Work Practice Controls (WPC) & Exposure Controls (EC)Emergency first aid for injuryPost-exposure counselingProphylaxisMedical evaluation and follow-up of exposed individuals
10Objectives- Evaluation Evaluate:The effectiveness of the Occupational Exposure Monitoring SystemAdapt any necessary modifications for improvementContinue to maintain an evolving system based upon current scientific findings
11Exposure Definition“An exposure is a percutaneous injury (e.g., a needle stick or cut with a sharp object) or contact of mucous membrane or nonintact skin (e.g., exposed skin that is chapped, abraded, or afflicted with dermatitis) with blood, tissue, or other body fluids that are potentially infectious.”CDC, MMWR , Vol. 50/No. RR-11, 3.
12Infectious Body Fluids “In addition to blood and body fluids containing visible blood, semen and vaginal secretions are also considered potentially infectious. Although semen and vaginal secretions have been implicated in sexual transmission of HBV, HCV and HIV, they have not caused occupational transmission from patient to health care worker.”CDC, MMWR , Vol. 50/No. RR-11, 3.
13Potentially Infectious Fluids The risk for transmission of HIV, HBV and HCV with the following body fluids is unknown, caution is recommended when handling : cerebrospinal fluid, synovial fluid, pleural fluid, peritoneal fluid, pericardial fluid, and amniotic fluid. They are considered to pose a potential risk for transmission.CDC, MMWR , Vol. 50/No. RR-11, 3.
14Low/No Risk Body Fluids “Feces, nasal secretions, saliva, sputum, sweat, tears, urine and vomitus are not considered potentially infectious unless they contain blood. The risk for transmission of HBV. HCV and HIV infection from these fluids and materials is extremely low.” Caution is recommended when handling these fluids.CDC, MMWR , Vol. 50/No. RR-11, 3.
15Saliva Infectious for HIV? In the absence of visible blood in the saliva, exposure to saliva from a person infected with HIV is not considered a potential risk for HIV transmission. However, caution is recommended when handling.CDC, MMWR , Vol. 50/No. RR-11, 3.
16Occupational Transmission of HCV Transmission from mucous membrane exposure to blood rarely occurs .HCV is not transmitted efficiently through occupational exposure to blood.Following percutaneous injury from HCV+ source infection rate is 1.8% (range 0%-7%).No transmission has been documented from nonintact or intact skin contact with HCV+ blood.CDC, MMWR, , Vol. 50/ No. RR-11, 5
17Survival of HBV in the Environment Only 1/2 of all HBV positive HCW’s recall having an occupational injury. (DIRECT)Many infected individuals can recall caring for HBV+ patients. (INDIRECT)HBV can survive in dried blood at room temperature on environmental surfaces for at least 1 week. Exposures have occurred via scratches, abrasions, burns or on mucosal surfaces with poor infection control. Evidence of outbreaks have occurred in Hemodialysis Units.CDC, MMWR , Vol. 50/No. RR-11, 4
18Occupational Transmission of HBV The risk of HBV transmission following needle stick is directly related to the amount of blood and the HBeAg status of the patient.Infection from HBeAg+ & HBsAg+ is: %Infection from HBeAg- & HBsAg+ is: %CDC, MMWR , Vol. 50/No. RR-11, 3.
19Post-Hepatitis B Vaccine Testing “Health Care Professionals who have contact with patients or blood and are at ongoing risk for percutaneous injuries should be tested 1-2 months after completion of the 3-dose vaccination series for anti-HBs.”Hepatitis B vaccine may be given during pregnancy, contains no infectious particles.CDC, MMWR /Vol. 50/No. RR-11, 16.
20Nonresponders to HBV Vaccine People who do not respond to the first three vaccine series <10 mIU/ml should complete a 2nd, 3 vaccine series.People who do not respond to the first HBV series only have a 30-50% chance of responding to the 2nd series.Testing at completion should be done to determine efficacy/or HbsAg status.CDC, MMWR , Vol. 50/No. RR-11, 16.
21PEP for HBV Exposures in Non-vaccinated HCW’s Health care workers who experience occupational exposure to the blood or body fluids of an HBsAg + individual should receive1 dose, 0.06mL/kg., of Hepatitis B immune globulin (HBIG), andThe 1st dose of the HBV vaccine series.
22PEP for HBV Non-responders When a person has not responded to the 1st HBV vaccine series & is exposed to the blood or body fluids of an HBsAg positive patient, a single dose of HBIG, preferably within 24 hrs. after exposure, and the first dose of the 2nd HBV vaccine series is preferred.CDC, MMWR. Vol. 50/ No. RR-11, 4.
23PEP for HBV for Non-responders HCW’s that experience occupational exposures to the blood or body fluids of HBsAg positive patients who are non-responders to both the 1st and 2nd HBV vaccine series should receive 2 doses of HBIG.One at the time of injury and the 2nd dose 1 month later.HBIG should be given with 24 hrs. if possible.When given in less than 7 days the effectiveness is approximately 75%. When given in > 7days after exposure effectiveness is uncertain.CDC, MMWR , Vol50/No. RR-11, 4
24Expert Consultation Advised When drug resistance is evidentHCW is pregnantSource is unknownSource is high risk for HIV infection
25Use of PEP When Source is Unknown Decision made case-by-casePPE worn, removes 50% of inoculumType: puncture, splash, lacerationSeverity : deep wound vs. superficialBody fluid and quantity: blood, saliva, large amount vs. minimal amount of body fluid
26Use of PEP When Source is Unknown (Cont) Environment : IDU clinic, shelter, community prevalence, etc.To treat: a 2 drug PEP for 4 weeks, reevaluate if new information is available, if negative discontinue medications. Do not test discarded needles for bloodborne pathogens.
27Factors that Increase the Probability of HIV Infection Exposure to a larger quantity of bloodInjury with a device with visible bloodDeep injuryInjury with device placed in vein/arteryInjury to blood from patient with advanced AIDSHost defense, immune response may prevent infection
28Management of Occupational Blood Exposure When an exposure occurs, you should stop immediatelyWash wound with soap & water; flush mucous membranes with water.Antiseptic use and/or bleeding the wound have not been proven to reduce infections.However, antiseptic use is not contraindicated.Bleach & other caustic agents should not be poured directly into the wound.
29Evaluation of Occupational Exposure Obtain informed consent.Test source for HBsAg, anti-HCV, and HIV antibody. Consider using a rapid HIV antibody test if available.For patients who refuse testing/or unknown patients, consider medical diagnosis, risk behaviors and S/S.Do not test discarded needles for bloodborne pathogens.
30HCV Exposures Following occupational injury on an HCV+ patient: Perform baseline & F/U testing for anti-HCV and alanine aminotransferase (ALT) 4-6 months after exposure.Perform HCV RNA 4-6 weeks after exposure, to determine active viral replication.Confirm repeatedly positive anti-HCV (EIAs) with additional tests.No vaccine or PEP are available for protection against HCV. IG is not recommended for PEP.
31Treating early HCV disease While there is currently no vaccine to prevent HCV infection, or PEP to prevent infection immediately following exposure, recent studies suggest that early treatment of acute HCV may prevent chronic infection.Therefore HCW’s should be vigilant with recommendations for follow-up and testing.
32Health Care Professional (HCP) Recommendations for PEP in HIV+ Source When an exposure occurs on an HIV patient a HCP will:Establish patients’stage of infection: HIV+ or AIDSObtain recent blood tests: CD4 cells, T-cell count, viral load & current medicationsDetermine if donor patient has a resistant strainIf information is not available, initiate PEPPEP should be initiated even if the exposure exceeds 36 hours
33Evaluation of HIV Exposure Following exposure on an HIV+ patient, assess and treat HCW, ideally within 2 hours.Perform HIV antibody testing for at least 6 months postexposure.Baseline6 weeks3 months and6 months.
34Evaluation of HIV Exposure If symptoms of acute retroviral syndrome appear test HIV antibody immediately.Advise to use precautions to prevent secondary transmission.Evaluate for side effects at 72 hours and every 2 week thereafter.Treat for 4 weeks.Consider the use of rapid testing.
35Basic PEP for HIV Exposures Basic Regimen (2 drugs): Zidovudine (AZT) & Lamivudine (3TC) available as COMBIVIR.ZDV: 600 mg/day, in 2 or 3 divided doses & 3TC: 150mg twice daily, or give as one COMBIVIR tab twice daily for 4 weeks. Serious toxicity is rare, side effects are manageable, documented to reduce infection by approximately 81% CDC, MMWR, , Vol. 50/No. RR-11, 9.Other basic 2 drug regimens include: TC & Stavudine (d4T); or d4T & Didanosine (ddl), and should be considered in areas of the country where COMBIVIR resistance is common CDC,MMWR, , Vol. 50/No. RR-11, 10.
36Expanded PEP for HIV Exposures An expanded 3 drug regimen should be considered for exposures that pose an increased risk for infection.A 3 drug regimen includes a basic 2 drug regime plus the addition of a Protease Inhibitor.Bartlett J J. Hopkins Univ. School of Medicine, Medical Management of the HIV Infection, 66.
37HIV PEP for Percutaneous Injuries Patient StatusExposureLow Risk-AsymptomaticVLHigh Risk-AIDS Symptomatic, AIDS or VLUnknownNot severe, superficial or injury with solid needle or instrument2 drug PEP3 drug PEPUsually none, *consider drug PEPSevere, blood on device, deep woundUsually none, *consider 2 drug PEPVL- Viral load, low <1,500 c/ml, high >1,500c/ml * Consider if source is high HIV risk
38HIV PEP for Non-intact Skin & Mucous Membrane Exposures Patient StatusExposureLow Risk- VL, AsymptomaticHigh Risk- VLAIDS, blood on instrumentUnknownSmall volume (drops)Consider 2 drug PEP2 drug PEPUsually none, consider 2 drug PEP*Large volume, major spill3 drug PEPVL-Viral load, low <1,500 c/ml., high >1,500 c/ml * Consider if source has HIV risk
39Risk of HIV Infection Following Percutaneous Exposure to HIV+ Blood For a mucous membrane exposure0.09%For a percutaneous exposure risk0.3%.For nonintact skin< 0.09%
40Management of HIV Negative Exposure “If source person is HIV seronegative and has no clinical evidence of AIDS or symptoms of HIV infection, no further testing of the person for HIV infection is indicated.The likelihood of the source person being in the “window period” of HIV, in the absence of acute retroviral syndrome, is extremely small.”
41Management of Human Bites Evaluation of human bites must include both the person who is bitten and the person who inflicted the bite, since both parties were potentially exposed to the other persons blood.All counseling, testing, PEP and follow-up must be conducted on both parties for HIV, HBV & HCV.
42Surveillance of Health Care Workers with HIV/AIDS, June 30, 2001 Ref: CDC Natl. Center for HIV, STD and TB PreventionThrough 6/30/01, 23,473 adults with AIDS reported working in health care. This represents 5.1% of the 561,495 reported cases.Physicians ,746 Therapists 1,042Surgeons Health Aids 5,222Nurses ,105 Maintenance workers &Dental workers Administrative staffParamedicsTechnicians 3,046
43Surveillance of Health Care Workers with HIV/AIDS, June 30, 2001 Ref: CDC Natl. Center for HIV, STD and TB PreventionFifty-seven health care workers in the U. S. have seroconverted to HIV following occupational exposures. Twenty-six have AIDS.Laboratory workers (16 clinical labs)NursesPhysiciansSurgical technicians 2Dialysis technicians 1Respiratory therapist 1Health aideEmbalmer 1Housekeepers 2
44Surveillance of Health Care Workers with HIV/AIDS, June 30, 2001 Ref: CDC Natl. Center for HIV, STD and TB PreventionTypes of InjuriesPercutaneous (puncture or cut)Mucotaneous (mucous membrane and/or skin)Percutaneous & MucotaneousUnknownBody FluidsBloodConcentrated virus in a laboratoryVisibly bloody fluidUnspecified fluids
45Occupational Exposure Assessment Criteria Type of exposurePercutaneousMucous membraneNonintact skinBites with blood contamination to either personType & Amount of fluidBloodFluids containing bloodPotentially infectious fluid/tissue, i.e. semen, vaginal secretions, etc.Direct contact with concentrated virusCDC, MMWR , Vol. 50/ No. RR-11, 17.
46Occupational Exposure Assessment Criteria Infectious Status of SourceHIV antibody statusHCV antibody statusHBsAg statusImmune Status of Exposed HCWHBV, HCV & HIV immune statusHepatitis B vaccine & vaccine response statusCDC, MMWR , Vol. 50/No. RR-11, 18.
47Occupational Exposure Report Date & time of injuryProcedure being performed,If sharp device caused injury, include type, manufacturer & how injury occurredType & amount of fluid, severity (deep vs. superficial), condition of skin (chapped, intact)Source patients HIV, HBV, HCV status & stage (HIV viral load, resistance & antiretroviral meds)Exposed HCW’s HBV vaccine status & responseCounseling, post-exposure treatment & follow-upCDC, MMWR , Vol. 50/No. RR-11, 17
48Occupational Exposure Resources National Clinicians’ Post-exposure Hotline: PEPline orCDC, STD, AIDS Hotline: AIDSHepatitis Hotline:CDC reporting for occupationally HIV infected HCW’s & PEP failures:HIV antiretroviral pregnancy registry:
49Summary Occupational transmission for HIV and HCV is low: HIV %, HCV- 0- 7%Occupational transmission for HBsAg+ and HBeAg+ source:37-62%.Occupational transmission for HBsAg+ and HBeAg- source:23-37%.Rapid PEP is effective for HIV and HBV:HIV PEP-81%, HBV PEP –70-75%.No PEP available for HCVStandard Precautions, PEP and vaccination are critical components in reducing cross-transmission of bloodborne pathogens.CDC, MMWR , Vol.50 No. RR-11, pp. 3, 6, 7, 9.