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Smallpox

Smallpox (also known by the Latin names Variola or Variola vera) is a highly contagious disease unique to humans. It is caused by two virus variants called Variola major and Variola minor. V. major is the more deadly form, with a typical mortality of 20-40 percent of those infected. The other type, V. minor, only kills 1% of its victims. Many survivors are left blind in one or both eyes from corneal ulcerations, and persistent skin scarring - pockmarks - is nearly universal. more...

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Smallpox was responsible for an estimated 300-500 million deaths in the 20th century. As recently as 1967, the World Health Organization (WHO) estimated that 15 million people contracted the disease and that two million died in that year.

After successful vaccination campaigns, the WHO in 1979 declared the eradication of smallpox, though cultures of the virus are kept by the Centers for Disease Control and Prevention (CDC) in the United States and at the Institute of Virus Preparations in Siberia, Russia. Smallpox vaccination was discontinued in most countries in the 1970s as the risks of vaccination include death (~1 per million), among other serious side effects. Nonetheless, after the 2001 anthrax attacks took place in the United States, concerns about smallpox have resurfaced as a possible agent for bioterrorism. As a result, there has been increased concern about the availability of vaccine stocks. Moreover, President George W. Bush has ordered all American military personnel to be vaccinated against smallpox and has implemented a voluntary program for vaccinating emergency medical personnel.

Famous victims of this disease include Ramesses V (see Koplow, p. 11, plus notes), Shunzhi Emperor of China (official history), Mary II of England, Louis XV of France, and Peter II of Russia. Henry VIII's fourth wife, Anne of Cleves, survived the disease but was scarred by it, as was Henry VIII's daughter, Elizabeth I of England in 1562, and Abraham Lincoln in 1863. Joseph Stalin, who was badly scarred by the disease early in life, would often have photographs retouched to make his pockmarks less apparent.

After first contacts with Europeans and Africans, the death of a large part of the native population of the New World was caused by Old World diseases. Smallpox was the chief culprit. On at least one occasion, germ warfare was attempted by the British Army under Jeffrey Amherst when two smallpox-infected blankets were deliberately given to representatives of the besieging Delaware Indians during Pontiac's Rebellion in 1763. That Amherst intended to spread the disease to the natives is not doubted by historians; whether or not the attempt succeeded is a matter of debate.

Smallpox is described in the Ayurveda books. Treatment included inoculation with year-old smallpox matter. The inoculators would travel all across India pricking the skin of the arm with a small metal instrument using "variolous matter" taken from pustules produced by the previous year's inoculations. The effectiveness of this system was confirmed by the British doctor J.Z. Holwell in an account to the College of Physicians in London in 1767.

Edward Jenner developed a smallpox vaccine by using cowpox fluid (hence the name vaccination, from the Latin vacca, cow); his first inoculation occurred on May 14, 1796. After independent confirmation, this practice of vaccination against smallpox spread quickly in Europe. The first smallpox vaccination in North America occurred on June 2, 1800. National laws requiring vaccination began appearing as early as 1805. The last case of wild smallpox occurred on October 26, 1977. One last victim was claimed by the disease in the UK in September 1978, when Janet Parker, a photographer in the University of Birmingham Medical School, contracted the disease and died. A research project on smallpox was being conducted in the building at the time, though the exact route by which Ms. Parker became infected was never fully elucidated.

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Smallpox vaccine: contraindications, administration, and adverse reactions
From American Family Physician, 9/1/03 by Douglas M. Maurer

Smallpox vaccine evolved from variolation, a technique that was developed in China and the Ottoman Empire. Variolation involved the deliberate exposure of nonimmune persons to material taken from known smallpox victims. Lady Montague, the wife of the British ambassador to the Ottoman Empire, observed variolation firsthand and advocated use of the technique in England. In 1798, the British physician Edward Jenner used a milkmaid's lymph containing cowpox virus to vaccinate a child. (1)

Over the next 150 years, smallpox vaccine became the most successful vaccine in history. Until 1972, this vaccine was routinely given to U.S. children. (2) In 1966, the World Health Organization embarked on a program that culminated in the 1980 declaration that smallpox had been eradicated worldwide. (3)

Because of the events of September 11, 2001, concern has risen that terrorist organizations or rogue states might use smallpox as a biologic weapon. (4) In December 2002, the U.S. government began a smallpox vaccination program for civilian public health and hospital workers, including selected physicians, nurses, and ancillary personnel. The U.S. military also initiated a vaccination program for selected service members.

Smallpox Vaccine

Smallpox vaccine contains live vaccinia virus, a milder cousin of the variola (smallpox) virus.5 It does not contain smallpox virus and cannot cause smallpox. The vaccine contains lyophilized calf lymph and traces of polymyxin B, streptomycin, tetracycline, and neomycin. (6) The vaccine diluent is 50 percent glycerin with a small amount of phenol.(6) The vaccine does not contain egg byproduct or thimerosal. (6)

Once smallpox vaccine is reconstituted, it can be refrigerated and used for up to 60 days. (7) After a single vaccination, 95 percent of patients are protected within 10 days, (8,9) and immunity lasts at least five years (longer after revaccination). (2,10) [Reference 8-Evidence level C, consensus/expert guidelines]

CONTRAINDICATIONS

The contraindications listed in Table 1 (8,11,12) apply to potential vaccinees and their household contacts, including sexual contacts. (8,11) [Reference 11-Evidence level C, consensus/ expert guidelines] The contraindications listed in Table 2 (8,11,12) apply only to potential vaccinees. (8,11)

Steroid use is a contraindication to smallpox vaccination if the dosage of prednisone or its equivalent exceeds 2 mg per kg per day or 20 mg per day for two or more weeks. (5) Patients must discontinue immunosuppressive treatment at least three months before they are vaccinated. (6) Administration of smallpox vaccine is not contraindicated in patients who use nasal or oral steroid-containing inhalers or who receive soft tissue or joint injections containing steroids.

Before vaccination, confidential testing should be offered to potential vaccinees who are unsure of their pregnancy or human immunodeficiency virus (HIV) status. There are no absolute contraindications to vaccination of patients directly exposed to smallpox. (5,8)

VACCINATION TECHNIQUE

Smallpox vaccine is given with multiple punctures of a bifurcated needle (Figure 1). (13) The skin over the deltoid muscle or posterior arm is the most common vaccination site. If alcohol is used to cleanse the vaccination site, the site must be allowed to dry completely before the vaccine is administered. (6)

[FIGURE 1 OMITTED]

The bifurcated needle is held perpendicular to the skin and pressed rapidly into the skin three times for primary vaccination and 15 times for revaccination. Patients born before 1972 and patients who received smallpox vaccine more than 10 years ago should not be considered immune and should receive 15 punctures. (2,6)

The needle should be pressed against the skin firmly enough to cause a trace of blood to appear at the site within 15 to 20 seconds. (6) Excess vaccine is absorbed with sterile gauze, and the site is covered with gauze secured with tape.

CARE OF VACCINATION SITE

After vaccination, care must be taken to prevent autoinoculation or transmission to contacts. Vaccinees are infectious from about the third day after vaccine receipt until the scab falls off, which may take three to four weeks. (14)

Vaccinees should be educated not to touch the actual vaccine site or allow others to touch it. After intentional or accidental contact with the site, vaccinees should wash their hands with soap and water or an alcohol-based (more than 60 percent) hand rinse. (11)

The vaccination site should remain covered, and the dressing should be changed every one to three days. No creams, ointments, or topical antibiotics should be applied to the site. Contaminated dressings should be handled like infectious waste. (11,14)

Vaccinees' clothing, towels, and bed linen should be kept separate from those of unvaccinated contacts. While vaccinees have no restrictions on food preparation or travel, they should avoid public swimming or bathing. (11)

When health care workers are involved in patient care, they should cover their vaccination site with a semipermeable dressing and wear long-sleeved clothing to further reduce the risk of transmission. Vaccinated health care workers should assist each other with dressing changes. Medical leave is not required unless a health care worker develops debilitating symptoms or is unable to adhere to the precautions described above. Currently, there are no absolute restrictions on vaccinated health care providers interacting with infants, pregnant mothers, or immunosuppressed patients. (11)

Natural Course of Smallpox Vaccination

Responses to smallpox vaccine can be major or equivocal. (15) The major response (Jennerian response or "take") involves a two- to three-week progression from papule to vesicle to pustule to scab (Figure 2). (16) All other responses are equivocal ("nontakes"). This vaccination process takes approximately 15 days in primary vaccinees and eight days in revaccinees. (8,9,11)

[FIGURE 2 OMITTED]

Normal reactions to smallpox vaccination include erythema, edema, regional lymphadenopathy, fever, malaise, and urticaria (8) (Figure 3). (17) These reactions require only observation and symptomatic treatment. In clinical trial settings, up to one third of vaccinees may be ill enough to miss work or have difficulty sleeping. (8) Historically, approximately 21 percent of first-time vaccinees consulted a physician because of bothersome reactions. (18) In contrast, recent data on military hospital workers demonstrated a 3 percent sick-leave rate. (7,19)

[FIGURE 3 OMITTED]

Approximately 10 percent of first-time vaccinees have "robust takes." (8) These reactions include large areas of erythema and extensive lymphadenopathy or lymphadenitis (Figure 4). It may be difficult to distinguish robust takes from bacterial infections. Robust takes occur eight to 10 days after vaccination and resolve spontaneously within 72 hours. (8) No treatment is necessary.

If an equivocal response occurs, vaccination should be repeated with 15 punctures. (6,11) A revaccinee should be considered immune if no take occurs after two attempts, while a primary vaccinee should be referred for immunologic evaluation if no take occurs after two attempts. Currently, there are no recommendations regarding the revaccination interval.

Smallpox vaccine may be administered simultaneously with any inactivated or live virus vaccine, except varicella vaccine. (8) Smallpox and varicella vaccines should be administered at least 28 days apart to avoid confusing vaccinerelated skin lesions.

Adverse Reactions to Smallpox Vaccine

Rates of adverse reactions to smallpox vaccine are lower in revaccinees. (9,20) Data from the 1960s suggest that 1,000 of every 1 million vaccinees will have a serious reaction to the vaccine, and that approximately one in 1 million primary vaccinees and one in 4 million revaccinees will die. (20,21) Rates of adverse reactions and death could vary considerably today. Although current populations may have a higher percentage of immunocompromised persons, such as those with HIV infection, significant advances have been made in the supportive care of critically ill patients.

Accidental implantation (autoinoculation) is the most common adverse reaction, occurring in approximately 600 of every 1 million vaccinees. (18) The face, genitals, and rectum often are affected, and children are at highest risk. (14) The best preventive measure is scrupulous handwashing. (14) Vaccinia immune globulin (VIG) is reserved for treatment in severe cases.

Patients with a history of eczema or atopic dermatitis, even if currently inactive, may develop eczema vaccinatum subsequent to smallpox vaccination (Figure 5). (8) This condition occurs in 10 to 39 of every 1 million vaccinees and is sometimes fatal. (18) Management includes intravenous hydration and meticulous skin care. (8) High-dose VIG therapy has reduced the mortality rate for eczema vaccinatum from between 30 and 40 percent to 1 percent. (20) [Evidence level C, consensus/expert guidelines]

[FIGURE 5 OMITTED]

Approximately three to 15 of every 1 million vaccinees develop postvaccinial central nervous system (CNS) disease. (20) Postvaccinial encephalopathy usually affects vaccine recipients younger than two years and develops six to 10 days after vaccination, while postvaccinial encephalitis usually affects those older than two years and occurs 11 to 15 days after vaccination. (8) Patients may present with headache, fever, vomiting, seizures, and coma. The mortality rate for this condition is 25 percent, and 25 percent of survivors have permanent neurologic deficits. (20) Treatment is supportive, because VIG is not useful. (8)

Progressive vaccinia only occurs in patients with a defective immune system. The condition involves unchecked viral replication, with progressive necrosis leading to severe viremia, shock, and death. Progressive vaccinia should be suspected in patients with vaccination sites that continue to progress beyond two weeks without apparent healing (22) (Figure 6). (8) High-dose VIG and cidofovir (Vistide) are the only known therapies. (8,23)

[FIGURE 6 OMITTED]

Occasionally, patients develop generalized vaccinia, in which viremia causes distant skin lesions (Figure 7). (24) Generalized vaccinia usually occurs six to nine days after primary vaccination. (22) Although visually distressing, this condition is typically benign and resolves spontaneously in one to two weeks. VIG may be used in patients with severe or recurrent vaccinia. (8)

Patients with inflammatory eye diseases are at risk for ocular vaccinial diseases, including blepharitis, iritis, and keratitis. Keratitis can lead to corneal clouding, ulceration and, possibly, blindness. Ocular vaccinial infections may respond to antiviral eye drops such as trifluridine (Viroptic) and to parenterally administered VIG. (8) However, treatment with VIG is contraindicated in patients with keratitis, because this agent has been associated with the development of corneal opacities. (9) Patients with ocular vaccinial disease should be treated in consultation with an ophthalmologist.

Fetal vaccinia is a rare complication of smallpox vaccination, with only 50 cases reported in the literature. (8) The condition results from inadvertent vaccination during pregnancy or shortly before conception and leads to stillbirth or neonatal death. There is no reliable diagnostic test to confirm intrauterine infection. Pregnant women who have been inadvertently vaccinated should be referred to a perinatologist.

Although previously reported in vaccinees in Europe and Australia who received various smallpox vaccines, myopericarditis was reported rarely in vaccinees who received the New York Board of Health strain. (19,25) Since January 2003, there have been more than 58 cases reported. (19,25,26) It is unclear if this is truly an increase in incidence or simply better reporting. (25) The exact cause is unknown. Patients typically present four to 30 days after vaccination with chest pain, electrocardiographic changes, elevated cardiac enzyme levels and, occasionally, abnormal echocardiograms. Cases have ranged from mild to severe. (25) All patients have recovered fully with supportive care only. (19,25,26)

Rarely, the vaccine site may become secondarily infected, typically with staphylococci or streptococci. More commonly, a variety of nonspecific skin rashes, including erythema multiforme, may occur after smallpox vaccination. A recent trial (27) describes vaccine-associated folliculitis as another possible cutaneous complication of smallpox vaccination.

Treatment of Adverse Reactions

VIG can be used in patients with extensive autoinoculation, eczema vaccinatum, severe or recurrent generalized vaccinia, or progressive vaccinia. (8,11) VIG is not recommended for use in patients with mild autoinoculation, mild generalized vaccinia, erythema multiforme, or postvaccinial CNS disease. VIG therapy is contraindicated in patients with vaccinia keratitis. (9)

VIG without thimerosal is now available and meets the same standards as intravenous immune globulin. The usual dose is 0.6 mL per kg intramuscularly or 100 to 500 mg per kg intravenously. (8) Adverse reactions to VIG include local site reactions, nausea, vomiting, fever, aseptic meningitis and, rarely, anaphylaxis. (8) VIG is administered under an investigational drug protocol and can be obtained only through the CDC or the U.S. military.

Cidofovir has been approved for use under an investigational drug protocol. The drug is licensed for the treatment of cytomegalovirus retinitis in patients with acquired immunodeficiency syndrome. Cidofovir has in vivo and in vitro activity against vaccinia virus. (8)

Cidofovir never has been used to treat vaccinia virus infections in humans. This agent is reserved for the treatment of patients who do not respond to VIG or are near death. (8) Cidofovir usually is given in a single intravenous dose of 5 mg per kg over 60 minutes. If clinically indicated, the dose may be repeated after one week. Patients treated with this agent should be monitored for renal toxicity.

Documentation and Reporting

The vaccinee should return to the office or clinic in six to eight days to be evaluated for vaccine response. (8,11) Vaccination should be documented in the patient's health record.

Adverse reactions to smallpox vaccine should be reported to the Vaccine Adverse Event Reporting System (VAERS). Lost work time in excess of 24 hours and any need for hospitalization also should be reported. Reports can be submitted to VAERS via the Internet (www.vaers.org) or by telephone (800-822-7967). Further information, including requests for VIG or cidofovir, can be obtained from the CDC Clinician Information Line (877-554-4625). Web sites for further information on smallpox vaccine are provided in Table 3.

Current Experience with Smallpox Vaccine

From January through July 2003, more than 38,000 U.S. civilians and more than 450,000 U.S. military personnel received the smallpox vaccine. As of July 25, 2003, the CDC reported three cases of generalized vaccinia, 18 cases of autoinoculation, 21 cases of myopericarditis, three cases of ocular vaccinia, and one case of postvaccinial encephalitis. Only one patient received VIG. (26)

The military experience through June 25, 2003 is notable for 36 cases of generalized vaccinia, one case of erythema multiforme, 48 cases of autoinoculation, 37 cases of myopericarditis, and one case of postvaccinial encephalitis. Two patients received VIG. (19)

Neither the CDC nor the U.S. military have reported any cases of eczema vaccinatum, fetal vaccinia, or progressive vaccinia. (19,26) All cases of generalized vaccinia and myopericarditis have occurred in primary vaccinees. (19,26) Overall, there have been fewer adverse reactions during this new vaccination period than what was predicted using historical data. (19,25)

Although there have been no deaths directly attributable to the smallpox vaccine, the CDC has reported five ischemic cardiac events following smallpox vaccination, with two deaths, and the U.S. military has reported one death from myocardial infarction five days after vaccination. (19) These events, along with the number of myopericarditis cases, have led to revised screening recommendations for patients with known cardiac disease, vessel-related conditions, or other risk factors.

The authors indicate that they do not have any conflicts of interest. Sources of funding: none reported.

The opinions and assertions contained herein are the private views of the authors and are not to be construed as official or as reflecting the views of the U.S. Army Medical Department or the U.S. Army Service at large.

REFERENCES

(1.) Magner LN. A history of medicine. New York: Dekker, 1992:239-52.

(2.) Henderson DA, Inglesby TV, Bartlett JG, Ascher MS, Eitzen E, Jahrling PB, et al. Smallpox as a biological weapon: medical and public health management. Working Group on Civilian Biodefense. JAMA 1999;281:2127-37.

(3.) World Health Organization. The global eradication of smallpox: final report of the Global Commission for the Certification of Smallpox Eradication, Geneva, December 1979. Geneva: World Health Organization, 1980.

(4.) Blendon RJ, DesRoches CM, Benson JM, Herrmann MJ, Taylor-Clark K, Weldon KJ. The public and the smallpox threat. N Engl J Med 2003;348:426-32.

(5.) Centers for Disease Control and Prevention. Summary of October 2002 ACIP smallpox vaccination recommendations. Atlanta, Ga., 2002. Retrieved August 2003 from: biotech.law.lsu.edu/blaw/bt/smallpox/acip-recs-oct2.pdf.

(6.) Dryvax (smallpox vaccine, dried, calf lymph type) [package insert]. Madison, N.J.: Wyeth Laboratories, Inc., 2002.

(7.) DoD Smallpox Vaccination Program safety summary, as of May 16, 2003. Retrieved July 24, 2003, from: www.smallpox.army.mil/media/pdf/SPSafetysum4.pdf.

(8.) Cono J, Casey CG, Bell DM. Smallpox vaccination and adverse reactions. Guidance for clinicians. MMWR Recomm Rep 2003;52(RR-4):1-28.

(9.) Lane JM, Goldstein J. Evaluation of 21st-century risks of smallpox vaccination and policy options. Ann Intern Med 2003;138:488-93.

(10.) Breman JG, Henderson DA. Diagnosis and management of smallpox. N Engl J Med 2002;346: 1300-8.

(11.) Wharton M, Strikas RA, Harpaz R, Rotz LD, Schwartz B, Casey CG, et al. Recommendations for using smallpox vaccine in a pre-event vaccination program. Supplemental recommendations of the Advisory Committee on Immunization Practices (ACIP) and the Healthcare Infection Control Practices Advisory Committee (HICPAC). MMWR Recomm Rep 2003;52(RR-7):1-16.

(12.) Smallpox (vaccinia) vaccine contraindications. Retrieved July 24, 2003, from: www.bt.cdc.gov/agent/smallpox/vaccination/contraindications-clinic.asp.

(13.) CDC clinician demonstrates the use of a bifurcated needle during the 2002 vaccinator workshop. Retrieved August 6, 2003, from: phil.cdc.gov/phil/results.asp?page=22.

(14.) Neff JM, Lane JM, Fulginiti VA, Henderson DA. Contact vaccinia-transmission of vaccinia from smallpox vaccination. JAMA 2002;288:1901-5.

(15.) WHO Expert Committee on Smallpox: first report. Geneva: World Health Organization, 1964.

(16.) Vaccine reaction images. Retrieved July 24, 2003, from: www.bt.cdc.gov/agent/smallpox/vaccineimages.asp.

(17.) Smallpox vaccination and adverse events training module. Retrieved August 6, 2003, from: www.bt.cdc.gov/training/smallpoxvaccine/reactions/default.htm.

(18.) Lane JM, Ruben FL, Neff JM, Millar JD. Complications of smallpox vaccination, 1968: results of ten statewide surveys. J Infect Dis 1970;122:303-9.

(19.) Grabenstein JD, Winkenwerder W Jr. U.S. military smallpox vaccination program experience. JAMA 2003;289:3278-82.

(20.) Lane JM, Ruben FL, Neff JM, Millar JD. Complications of smallpox vaccination, 1968. N Engl J Med 1969;281:1201-8.

(21.) Lane JM. Smallpox vaccination served great purpose, but was not always benign. Infect Dis News 2002;3:1-4. Retrieved June 2003 from: www.infectiousdiseasenews.com/200203/frameset.asp? article=guested.asp.

(22.) Goldstein JA, Neff JM, Lane JM, Koplan JP. Smallpox vaccination reactions, prophylaxis, and therapy of complications. Pediatrics 1975;55:342-7.

(23.) Bradbury J. Orally available cidofovir derivative active against smallpox. Lancet 2002;359:1041.

(24.) This was the face of a 1 yr. old child with a mild case of generalized vaccinia 2 wks. after receiving a primary vaccination. Retrieved August 12, 2003, from: phil.cdc.gov/phil/results.asp?page=10.

(25.) Halsell JS, Riddle JR, Atwood JE, Gardner P, Shope R, Poland GA, et al. Myopericarditis following smallpox vaccination among vaccinia-naive U.S. military personnel. JAMA 2003;289:3283-9.

(26.) Smallpox vaccination adverse events report. Retrieved August 14, 2003, from: www.cdc.gov/od/oc/media/spadverse.htm.

(27.) Talbot TR, Bredenberg HK, Smith M, LaFleur BJ, Boyd A, Edwards KM. Focal and generalized folliculitis following smallpox vaccination among vaccinia-naive recipients. JAMA 2003;289:3290-4.

DOUGLAS M. MAURER, D.O., and BRIAN HARRINGTON, M.D., M.P.H. Darnall Army Community Hospital, Ft. Hood, Texas J. MICHAEL LANE, M.D., M.P.H., Atlanta, Georgia

DOUGLAS M. MAURER, D.O., is a staff physician in the family practice residency program at Darnall Army Community Hospital, Ft. Hood, Tex. Dr. Maurer graduated from Ohio University College of Osteopathic Medicine, Athens, and completed a family practice residency at Tripler Army Medical Center, Honolulu.

BRIAN HARRINGTON, M.D., M.P.H., is program director for the family practice residency program at Darnall Army Community Hospital. Dr. Harrington received his medical degree from Dartmouth Medical School, Hanover, N.H., and a master of public health degree from the University of Washington, Seattle. He completed a family practice residency and faculty development fellowship at Madigan Army Medical Center, Ft. Lewis, Wash.

J. MICHAEL LANE, M.D., M.P.H., is retired from the faculty of the Department of Family and Preventative Medicine at Emory University School of Medicine, Atlanta. He is a former director of the Smallpox Eradication Program at the Centers for Disease Control and Prevention. Dr. Lane received his medical degree from Harvard University, Boston, and is board certified in public health and preventive medicine.

Address correspondence to Douglas M. Maurer, D.O., Darnall Army Community Hospital, Family Practice Residency Program, 36000 Darnall Loop, Ft. Hood, TX 76544 (e-mail: douglasmaurer@netscape.net). Reprints are not available from the authors.

COPYRIGHT 2003 American Academy of Family Physicians
COPYRIGHT 2003 Gale Group

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