Smallpox: Risks of Vaccination Patricia Lee MD

1. Smallpox: Risks of Vaccination Patricia Lee MD

2. Smallpox Vaccine Does Not Contain Smallpox • Live virus – Vaccinia - pox type virus • Vaccinia - mutated cowpox or variola virus • Unsure when switch came from cowpox to vaccinia • Can be transmitted to other parts of the body or other people • Other live virus vaccines: measles, mumps, rubella, chickenpox

3. Calf-lymph vaccine Dryvax • contains polymyxin B, neomycin sulfate, streptomycin sulfate, chlorotetracycline hydrochloride • Vero monkey kidney cell vaccine, human fibroblast cell vaccine- expected 2004

4. Smallpox Vaccine • 15 million doses available to US, plan to purchase 300 million more doses • Dilution seems effective with less side effects • Vaccinate up to 3 days post-exposure • Up to 4-7 days post-exposure may offer some protection or modify severity of disease

5. Vaccination and Immunity • First time vaccination: (45% population) • immunity lasts 3-5 yrs • Revaccination: • longer immunity- 10 yrs • A successful vaccination: “take” • If unsuccessful, revaccinate 7-10 days later

7. Vaccinia • Another pox type virus related to smallpox • Vaccine does not contain smallpox virus • cannot spread smallpox • Vaccinia can be spread through the vaccination site – touching site or bandage • Meticulous vaccination site care • It is not airborne

8. Vaccination • Given in upper arm • Bifurcated needle dipped in vaccine solution. • Skin is pricked 15 times in a few seconds. Small amount of bleeding • 3-4 days: red itchy bump • Week 1: large blister fills with pus, drains • Week 2 : blister begins to dry up and form scab • Week 3: Scab falls off, scar remains • First timers: stronger take • Diluted vaccine is effective

12. Who should NOT receive smallpox vaccine? • Up to 25% of population will be ineligible • Any person who has one of the following conditions OR lives with someone who does • Skin conditions: • Eczema or atopic dermatitis – even if not active • Other skin conditions – burns, chickenpox, shingles, impetigo, herpes, severe acne, psoriasis • Immunocompromised, eg. CA, steroid use, HIV • Pregnancy or plans to become pregnant within one month of vaccination

13. Who should NOT receive smallpox vaccine? • In addition, you should not get the vaccine if: • Less than 18 yrs old • Have small children < 1 yr old • Moderate or short term illness • Breastfeeding • Allergic to vaccine or any of its ingredients • Polymyxin B sulfate, Streptomycin sulfate, Neomycin sulfate • Chlorotetracycline hydrochloride • Inflammatory eye disease • EXCEPTION: If exposed to smallpox – you should get vaccine regardless of health status

14. Reactions to Smallpox Vaccination • Normal, typically mild reactions • Do not require treatment • Arm sore with intense erythema surrounding site • Tender impressive axillary adenopathy • Low grade fever 101, myalgias, malaise • 1 of 3 people may miss work, school, recreational activity, or have insomnia around day 4-7 • Bacterial infections of site - children

15. Reactions to Smallpox Vaccination • Serious Reactions • 1000 people/million vaccinated • Autoinoculation: common • Vaccinia rash limited to one area • Wash hands with soap and water after touching site • Generalized vaccinia - widespread vaccinia rash –due to viremia • Erythyma multiforme, other non vesicular rash • Vaccinia keratitis

16. Reactions to Smallpox Vaccination • Life Threatening Reactions** • 14-52 people/million vaccinated for 1st time (300,000) • Eczema vaccinatum – due to autoinoculation or contact with vaccinee • Progressive vaccinia (vaccinia necrosum) – seen in immunocompromised • Postvaccinal encephalitis **based on studies in 1968

17. Reactions to Smallpox Vaccination • 1-3 people/million vaccinated may die (30) • Serious reactions are lower for revaccination – 0.1 deaths/million • USA adverse events rate unknown: • higher due to number of immunocompromised (CA, Tx, HIV, eczema, etc.) or lower due to improved health care???

20. Satellite lesions

21. Satellite lesions

22. Revaccination

23. Revaccination

32. Vaccinia keratitis

36. Progressive vaccinia

45. Erythyma multiforme

46. Erythyma multiforme and revaccination

47. Post vaccination comments December 5, 2002 Washington Post • 200 healthy university students inoculated • 1/3 missed at least 1 day of work or school • “The reactions we saw were quite remarkable” • “I just wanted to go to bed for a day or two” • “I thought, can you just chop off my arm?” • “You can’t scratch it, it’s all bandaged up; all I could do was smack it” • “I was pretty miserable for 1 week” • “Range of reactions from small rash to swelling the size of a grapefruit” • “You are going to have to be prepared to see these individuals and to see really bad takes…you’ll wonder if they are bacterial infections; in some cases the rash will move up the arm and onto the chest. The vaccinee requires a lot of TLC”

48. Vaccine Safety • Best protection available against smallpox • Most people experience mild reaction • Treatment against serious reactions • Vaccinia Immune Globulin (VIG) 700 doses • CDC controlled • Enough if 6 million vaccinated • Cidofovir 3500 doses • enough if 15 million vaccinated

49. What are we waiting for? • Section 304 Homeland Security Bill covering liability of vaccinations, 1/24/03 • Tommy Thompson, Sec HHS will declare immunization program to start • Illinois to finalized issues of workman’s compensation • Chicago • 21 hospitals have replied with smallpox response plans • 7 hospitals have declined to participate • Others await corporate decisions regarding employee post vaccination care

50. Smallpox Response Team • CDC rollout vaccination plan for smallpox response team in hospitals • 50 health care workers/hospital • Expected 30 day completion • Revaccinate 7-10 days after