Rash illness evaluation

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Rash illness evaluation

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  • 1. Rash Illness Evaluation Department of Health and Human Services Centers for Disease Control and Prevention December 2002 Brought to you by

2. Rash Illness Evaluation Learning Objectives: Describe how to use the Diagnostic Algorithm Discuss CDC's experience with the use of the Algorithm Brought to you by Brought to you by 3. Need for a Diagnostic Algorithm? No naturally acquired smallpox cases since 1977, however, concern about use of smallpox virus as a bioterrorist agent Recommencing smallpox vaccination in the United States is likely to heighten concerns about generalized vesicular or pustular rash illnesses Brought to you by 4. Need for a Diagnostic Algorithm? Public health control strategy requires early recognition of smallpox case Clinicians lack experience with smallpox diagnosis Other rash illnesses may be confused with smallpox Brought to you by 5. ~1.0 million cases varicella (U.S.) this year and millions of cases of other rash illnesses If 1/1000 varicella cases is misdiagnosed1000 false alarms Need strategy with high specificity to detect the first case of smallpox Need strategy to minimize laboratory testing for smallpox (risk of false positives) Need for a Diagnostic Algorithm? Brought to you by 6. Assumptions/Limitations First case of smallpox may not be diagnosed until day 4-5 of rash First case of smallpox may not be diagnosed early if it presents atypically Hemorrhagic Flat/velvety Highly modified Brought to you by 7. Smallpox Disease Incubation Period: 7-17 days Pre-eruptive Stage (Prodrome): fever and systemic complaints 1-4 days before rash onset Brought to you by 8. Smallpox Disease Rash stage Macules Papules Vesicles Pustules Crusts (scabs) Scars Brought to you by 9. Smallpox: Day 2 of Rash Brought to you by 10. Smallpox: Day 4 of Rash Brought to you by 11. Smallpox Rash Vesicles Pustules Day 4 and 5 Days 7-11 Brought to you by 12. Classic Smallpox Lesions: Pustules Brought to you by 13. Rash Distribution Brought to you by 14. Differential Diagnosis Varicella is the disease most likely to be confused with smallpox Brought to you by 15. Differentiating Features: Varicella No or mild prodrome No history of varicella or varicella vaccination Superficial lesions dew drop on a rose petal Lesions appear in crops Brought to you by 16. Differentiating Features: Varicella Lesions in DIFFERENT stages of development Rapid evolution of lesions Centripetal (central) distribution Lesions rarely on palms or soles Patient rarely toxic or moribund Brought to you by 17. Varicella Brought to you by 18. Varicella Adult Case Brought to you by 19. Varicella: Infected Lesions Brought to you by 20. Differential Diagnosis Disseminated herpes zoster Impetigo Drug eruptions Contact dermatitis Erythema multiforme Brought to you by 21. Differential Diagnosis Enteroviral infections (especially Hand, Foot and Mouth) Disseminated herpes simplex Scabies, insect bites Molluscum contagiosum (in immunocompromised) Brought to you by 22. Differential Diagnosis Rare dermatological conditions Acne Secondary syphilis Rickettsial diseases Smallpox vaccine-related rashes Brought to you by 23. Goal: Rash Illness Algorithm Systematic approach to evaluation of cases of febrile vesicular or pustular rash illness Classify cases of vesicular/pustular rash illness into risk categories (likelihood of being smallpox) according to major and minor criteria developed for smallpox according to the clinical features of the diseaseBrought to you by 24. Investigation Tools Available through state health departments and at www.cdc.gov/smallpox Rash algorithm poster Health care providers link to view and print poster Protocol (written guide for use of poster) File can be downloaded and printedBrought to you by 25. Brought to you by 26. Investigation Tools Case investigation worksheet for investigation of febrile vesicular or pustular rash illnesses Questions on prodromal symptoms, clinical progression of illness, history of varicella, vaccinations for smallpox and varicella, exposures, lab testing Worksheet can be downloaded and printed from www.cdc.gov/smallpox Brought to you by 27. Brought to you by 28. Smallpox Surveillance Clinical Case Definition An illness with acute onset of fever > 101o F followed by a rash characterized by firm, deep- seated vesicles or pustules in the same stage of development without other apparent cause Brought to you by 29. Smallpox: Major Criteria Prodrome (1-4 days before rash onset) Fever >101 o F (38.3 o C) and >1 symptom: prostration, headache, backache, chills, vomiting, abdominal pain Classic smallpox lesions Firm, round, deep-seated pustules All lesions in same stage of development (on one part of the body) Brought to you by 30. Smallpox: Minor Criteria Centrifugal (distal) distribution First lesions: oral mucosa, face, or forearms Patient toxic or moribund Slow evolution (each stage 1-2 days) Lesions on palms and soles Brought to you by 31. Evaluating Patients for Smallpox V a r ic e lla T e s tin g O p tio n a l H is to r y a n d E x a m H ig h ly S u g g e s tiv e o f V a r ic e lla T e s t fo r V Z V a n d O th e r C o n d itio n s a s In d ic a te d D ia g n o s is U n c e r ta in L o w R is k fo r S m a llp o x (s e e c r ite r ia b e lo w ) N o n -S m a llp o x D ia g n o s is C o n fir m e d R e p o r t R e s u lts to In fx C o n tr o l C a n n o t R /O S m a llp o x C o n ta c t L o c a l/S ta te H e a lth D e p t N o D ia g n o s is M a d e E n s u r e A d e q u a c y o f S p e c im e n ID o r D e r m C o n s u lta n t R e -E v a lu a te s P a tie n t ID a n d /o r D e r m C o n s u lta tio n V Z V + /- O th e r L a b T e s tin g a s in d ic a te d M o d e r a te R is k o f S m a llp o x (s e e c r ite r ia b e lo w ) N O T S m a llp o x F u r th e r T e s tin g S M A L L P O X T e s tin g a t C D C S m a llp o x R e s p o n s e T e a m C o lle c ts S p e c im e n s a n d A d v is e s o n M a n a g e m e n t ID a n d /o r D e r m C o n s u lta tio n A le r t In fx C o n tr o l & L o c a l a n d S ta te H e a lth D e p ts H ig h R is k fo r S m a llp o x (s e e c r ite r ia b e lo w ) In s titu te A ir b o r n e & C o n ta c t P r e c a u tio n s A le r t In fe c tio n C o n tr o l o n A d m is s io n P a tie n t w ith A c u te , G e n e ra liz e d V e s ic u la r o r P u s tu la r R a s h Illn e s s Brought to you by 32. Immediate Action for Patient with Generalized Vesicular or Pustular Rash Illness Airborne and contact precautions instituted Infection control team alerted Assess illness for smallpox risk Brought to you by 33. High Risk: All 3 Major Criteria Prodrome (1-4 days before rash onset) Classic smallpox lesions All lesions in same stage of development (on one part of the body) Brought to you by 34. Response: High Risk Case Infectious diseases (and possibly dermatology) consult to confirm high risk status Alert health department Digital photos Alert CDC rash-illness response team specimen collection management advice laboratory testing at CDC Brought to you by 35. Moderate Risk Prodrome AND 1 other major criteria OR Prodrome AND >4 MINOR smallpox criteria Brought to you by 36. Response: Moderate Risk Case Infectious diseases (and possibly dermatology) consult Laboratory testing for varicella and other diseases Skin biopsy Digital photos Re-evaluate risk level at least daily Brought to you by 37. Low Risk No febrile prodrome OR Febrile prodrome AND 50% of the cases including 2 deaths have been varicella 12 diagnoses confirmed by lab and/or pathology; 11 clinically diagnosed Other diagnoses: drug reaction erythema multiforme disseminated herpes zoster disseminated HSV2 contact dermatitis other dermatological disorders Brought to you by 42. Experience with Implementation of Rash Algorithm Rule in Varicella Zoster Virus (VZV)!! Algorithm has limited variola testing by standard approach to evaluation Brought to you by 43. CONDITION Variola Major Eng./Wales, 1946-48 Variola Minor Somalia, 1977-79 Chickenpox 41 20 Acne 10 0 Erythema Multiforme 7 Allergic Dermatitis/Urticaria 7 1 Drug Rash 6 1 Vaccinia 5 1 TOTAL 97 29 Differential Diagnosis: Lessons from the Past Brought to you by 44. Generalized Rashes following Smallpox Vaccination: Generalized Vaccinia Uncommon, rate = 240 per million primary vaccinees from 10 state survey Occurs 6 to 9 days following vaccination Lesions usually small and superficial, mature more rapidly than smallpox lesions and more likely to be confused with modified smallpox Rash distribution is indiscriminate (follows no set pattern) History of recent vaccinia vaccination Brought to you by 45. Generalized Rashes following Smallpox Vaccination: Eczema Vaccinatum Rare but life-threatening complication of smallpox vaccination May occur in vaccinee or in a close contact 5 19 days following vaccination 40 per million primary vaccinees (10 state survey) Brought to you by 46. Generalized Rashes following Smallpox Vaccination: Eczema Vaccinatum 10-20 cases in contacts per million primary vaccinees (Neff, JAMA, 2002) Distribution is not centrifugal; lesions usually commence in abnormal areas of skin and then spread History of vaccination or contact with a vaccinee Brought to you by 47. Laboratory and Pathology Support for Rash Illness Evaluation Assess availability of laboratory and/or pathology testing locally (hospital and private labs) especially Tzanck smear and skin biopsy Contact State health department for other testing: VZV rapid tests/pathology DFA PCR Tzanck smear (alphaherpes virus infection) Brought to you by 48. Electron microscopy Pox virus Herpes virus Other viruses HSV1 and HSV2 Tzanck smear PCR and culture Laboratory and Pathology Support for Rash Illness Evaluation Brought to you by 49. Vaccinia