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> How contagious is vaccinia?

>

>

> Friends,

> To view the tables intact in the below article, go to the actual URL. To

> contact the article's author, write: sepkowik

> Jock

>

> http://content.nejm.org/cgi/content/short/348/5/439?query=TOC

>

> Volume 348:439-446 January 30, 2003 Number 5

>

> How Contagious Is Vaccinia?

> Kent A. Sepkowitz, M.D.

>

> The Department of Health and Human Services is finalizing plans for a U.S.

> vaccination program against smallpox. As more vaccinia virus vaccine has

> become available, the debate over how many persons to vaccinate has

centered

> on two issues: the safety of the live vaccine and the transmissibility of

> vaccinia virus from a recently vaccinated person to a susceptible host.

> The issue of safety has received substantial attention, given that a

> predictable number of adverse events will occur among vaccine recipients.

> Furthermore, an extensive literature has established credible estimates of

> the complication rates.1,2,3,4 The risk of secondary transmission,

however,

> is discussed much less, perhaps because relatively little is known. A

report

> on vaccine-related deaths in the United States during the 1960s found that

> 12

> of the 68 deaths occurred in unvaccinated persons exposed to recently

> vaccinated family members or friends, a finding that demonstrates the

> potential gravity of the problem.5 A recent reconsideration of the

> transmission rates during the 1960s concluded that spread is remarkably

> infrequent; this finding is quite reassuring for immunocompetent persons

in

> the general population.4

> However, the finding of infrequent transmission may not apply to

hospitals,

> where large numbers of workers will be vaccinated, many for the first

time.

> There is a large concentration of immunocompromised patients in hospitals,

a

> situation distinctly unlike that in 1947, the last time a mass vaccination

> campaign was mounted in the United States. The prospect that a series of

> decisions might unwittingly introduce a live, transmissible, and

potentially

> lethal virus into hospitals has dampened the enthusiasm of many for

> widespread vaccination.

> In this article, I review the literature on the secondary transmission of

> vaccinia virus, including transmission in hospitals, among families, and

in

> other circumstances. Many of the older articles would not pass modern peer

> review. However, the information they contain cannot be obtained

elsewhere —

> a fact that makes them, however limited, of real value.

> Nosocomial Spread

> Nosocomial spread of vaccinia virus has been reported at least 12 times,

> from

> 1907 through 1975, and has resulted in 85 secondary

> cases6,7,8,9,10,11,12,13,

> 14,15,16,17 (Table 1). Several additional outbreaks of Kaposi's

> varicelliform

> eruption unrelated to vaccinia virus have also been described. The cause

of

> this diffuse skin eruption, whose name is often incorrectly used

> interchangeably with eczema vaccinatum (a known complication of vaccinia

> virus vaccination), was debated till the middle of the 20th century.

Experts

> argued whether herpes simplex or vaccinia was the more likely cause;

current

> thinking accepts both these and other viruses as etiologic agents. Studies

> that clearly demonstrated herpes simplex to be the cause of a patient's

> Kaposi's varicelliform eruption are therefore not discussed in this

> article.18

> ,19,20

> About three fourths of the cases of secondary vaccinia infection occurred

in

> young children with a dermatologic disorder, usually eczema (currently

> referred to as atopic dermatitis). These children had eczema vaccinatum, a

> syndrome of diffuse dermatitis with open vesicles, fever, regional or

> generalized adenopathy, and (rarely) encephalitis. Vaccinia could easily

be

> cultured from the lesions. Many patients in whom eczema vaccinatum

develops

> have active eczema at the time; the others have only a history of the

> condition.4,21 Those without active lesions may have a less severe form of

> eczema vaccinatum.4 Other skin conditions that may predispose a patient to

> secondary acquisition of vaccinia virus include seborrheic dermatitis,

> impetigo, scabies, burns, and pemphigus foliaceus. Reports of

> non–outbreak-related disease have described secondary transmission to

areas

> of acne and accidental skin abrasion.12

> The incidence of secondary transmission of vaccinia virus is not easily

> calculated. In Glasgow, Scotland, after a three-year-old girl with eczema

> vaccinatum was hospitalized, all 11 children on her ward and 4 on an

> adjoining ward had generalized disease.7 Smaller series from Germany,6

> Sweden,

> 9 Philadelphia,10 and São Paulo, Brazil,15 demonstrated transmission to 16

> of

> 27 susceptible patients (59 percent). In a single outbreak involving

adults

> at a hospital in Brazil where vaccination was given to several patients

with

> pemphigus foliaceus, 16 unvaccinated persons developed secondary

disease.16

> However, because many patients on the ward were vaccinated simultaneously,

> the opportunity for exposure increased. Furthermore, the denominator was

not

> clearly defined but may have included 187 patients whose vaccine history

was

> unknown, yielding an incidence of secondary vaccinia of about 9 percent.

> A single French report examined the contribution of the duration of

exposure

> to the risk of vaccinia virus transmission. An infant presented in the

> daytime with eczema vaccinatum, was hospitalized on an eczema ward, and by

> evening was transferred to isolation.13 Despite this, four secondary cases

> occurred in children on the eczema ward, though none had close contact

with

> the index case.

> The exact route of transmission is also uncertain. In the above study,13

all

> of the children were confined to cribs and were too ill to interact. In

> another, after hospitalization of the index patient, several cases of

> disease

> occurred in an adjoining ward.7 Although the affected children did not

mix,

> they were cared for by the same professional staff. A sore throat

developed

> in three treating nurses, one of whom had several " pustular bullae " on the

> forearms, but none were formally evaluated.7 In a carefully studied case

of

> transmission from an adult with disseminated vaccinia to a woman with

active

> mycosis fungoides in California, investigators remained uncertain how the

> virus moved from the isolation room to the woman, whose room was some 25 m

> (75 ft) away.17 They suggested that perhaps health care workers carried

the

> virus or that the two patients occupied the same hall area for several

> hours,

> resulting in fomite-based spread. The studies also raise the possibility

of

> aerosol transmission of vaccinia virus.7,8,13 Any of these potential

methods

> of spread has substantial implications for infection-control teams that

may

> be called on to isolate and care for a patient with eczema vaccinatum.

> Yet another route of transmission was demonstrated by a unique outbreak in

> Italy, where vaccinia was spread by a contaminated urinary catheter.14

After

> her older brother received vaccine, a 13-month-old girl had initially

> undiagnosed genital lesions and dysuria resulting from vaccinia infection.

> At

> the hospital, she was catheterized, and the catheter was then placed in a

> pan

> of Citrosil solution for sterilization. Several other urinary catheters

were

> soaking in the same pan. Within a five-week period, there were 23

secondary

> cases with vulvar–urethral vaccinia; each of the patients had been

> catheterized with one of the contaminated catheters. About half had high

> fevers, and some had gross hematuria. Virus was cultured from the urine of

> several children.

> Two reports have clearly defined the epidemic curve of vaccinia virus

> infection. In the 1935 outbreak in Glasgow, all secondary cases occurred

> between 8 and 18 days after exposure.7 Examination of patients treated at

an

> infectious-disease hospital in Brooklyn, New York, after the 1947 mass

> vaccination in New York City found an average incubation period of 10.6

days

> (range, 5 to 19).11

> Nine of the 85 reported patients (11 percent) died. Worsening severity of

> disease with each generation of transmission was seen in one outbreak in

> Germany.8 In another report, from Scotland, those in whom disease

developed

> later tended to have milder symptoms.7 Death was typically due to

> encephalitis or the development of secondary bacterial pneumonia.

Treatment

> included antibacterial agents and, for several, vaccinia immune globulin.

> Spread within Families

> Numerous reports have described the spread of vaccinia virus within

> families.

> The majority are instances of single transmission, usually from a recently

> vaccinated child to an unvaccinated younger sibling.22,23,24,25 However,

two

> or more secondary cases have been reported in at least eight reports of

> family outbreaks published from 1931 to 198126,27,28,29,30,31,32,33 (Table

2

> ). Many of the reports describe severe, sometimes fatal eczema vaccinatum

in

> the first family member with secondary disease and substantially milder

> local

> inoculation disease in the rest of the family. These latter infections

might

> have been overlooked had medical attention not been sought for the severe

> case.

> These eight reports describe transmission to 27 family members. Only five

> (19

> percent) had previously received vaccine; these persons invariably had

> milder

> disease. Of 19 whose skin examination results were noted, 6 had current or

> previous eczema, including the 3 (11 percent) with fatal disease, none of

> whom had previously received vaccinia virus vaccine. Death was invariably

> from fulminant disease, occurring before vaccinia immune globulin could be

> administered.

> In many of the family outbreaks,27,28,29,30 sharing close quarters was a

> significant factor, suggesting the need for sustained, intimate contact to

> transmit vaccinia between intact hosts. In one outbreak, a bed was shared

by

> three persons in whom disease developed, further supporting this notion.27

> An

> unusual aspect of the family outbreaks of vaccinia was the apparent

tendency

> for lesions to be present in similar anatomical areas in all secondary

> cases,

> including the mouth32 and the face.33

> Other Transmission

> Scattered reports detail other cases of secondary transmissions of

vaccinia,

> exclusively by inadvertent inoculation.34,35,36,37,38,39,40 Eyelids, lips,

> nose, and vulva were most commonly reported.32 Humphrey found 70 cases of

> vulvar vaccinia in the literature,37 including the 24 catheter-related

cases

> described above,14 many due to auto-inoculation and several from sexual

> transmission.31,34 The mucosa may be involved because vaccinia can

penetrate

> more easily into this tissue than into skin. Alternatively, vaccinia may

> have

> a tropism for mucosal surfaces. This phenomenon may be important, since

many

> currently hospitalized patients, such as those receiving chemotherapy,

have

> substantial mucosal abnormalities and therefore may be at higher risk for

> acquisition of secondary vaccinia virus infection.

> Occupational spread to the hands of those working with vaccinia virus

> vaccine

> has been described, and many workers have repeated local infection despite

> previous vaccination.41 A sustained outbreak occurred among 22 farm

workers

> and 450 cows on a dairy farm in El Salvador.42 One of the workers had

> received vaccine and resumed milking cows before his lesions had resolved,

> thereby spreading the virus to cows and thence to coworkers, including the

> woman who washed the towels used by the milkers. In all 22 affected

workers,

> lesions were confined to the hands and genitals.

> Implications for Vaccination Policy

> The rate of adverse events after vaccinia virus vaccination is being

> carefully scrutinized as a national vaccination policy is

developed.1,2,3,4

> Relatively little is known, however, about the risk of secondary

> transmission

> of this live virus in the hospital setting.4 A review of the literature

> indicates that nosocomial transmission does occur and that the outcome may

> be

> fatal in up to 11 percent of cases. Nosocomial outbreaks seem to require

> relatively minor contact with a source case, whereas spread in the home

> appears to occur only with sustained, intimate exposure, perhaps owing to

> immunologic and dermatologic differences among the persons exposed.

> Information regarding secondary transmission is particularly important for

> health care facilities, which will need to vaccinate workers while

ensuring

> patients' safety. The composition of hospitalized patients in the 21st

> century is dramatically different from that in the mid-20th century.

> Patients

> treated before the 1950s were very unlikely to be immunosuppressed: cancer

> chemotherapy was just beginning; transplantation had not yet been

performed;

> the human immunodeficiency virus (HIV) was unheard of; and corticosteroid

> therapy had only recently been introduced.

> Now, approximately 506,154 persons in the United States are known to be

> living with HIV43; 1.2 million new non-skin cancers are diagnosed

> annually44;

> 2.1 million persons have rheumatoid arthritis and receive therapy with

> corticosteroids or other immunosuppressive agents45; and more than 14

> million

> have asthma, many of whom require intermittent steroid use.46 Thousands of

> solid-organ and bone marrow transplantations are performed each year and

> tens

> of thousands of transplant recipients are alive and still receiving

> immunosuppressive therapy. Atopic dermatitis is also more common, with

> prevalence among children ranging from 6.8 percent to 17.2 percent.47

> Finally, there are tens of thousands of patients in intensive care units

and

> newborn nurseries. Current expert opinion recommends that vaccination of

> such

> persons should be avoided.48 Vaccination can be avoided, but contact with

a

> recent vaccinee probably cannot.

> Of equal importance are the differences in the modern population of health

> care workers, some of whom are themselves immunocompromised. Previously,

> hospitals were staffed with workers who had received at least one vaccinia

> virus vaccine. Such persons were therefore unlikely to initiate or

propagate

> an outbreak. In contrast, most current health care workers are susceptible

> to

> smallpox and vaccinia and so might play a dangerous supporting or even

lead

> part in any nosocomial outbreak.

> Both the rate and route of vaccinia transmission remain unknown. The

> incidence derived from the cited studies (9 to 59 percent) is certainly an

> overestimation of current risk, owing to erratic infection-control

practices

> in past decades, differences in the virulence of the vaccinia virus used,

> and

> a substantial reporting bias. The current plan for an occlusive dressing

at

> the vaccination site and other now-routine infection-control procedures,

> including hand hygiene and isolation for any patient with unexplained

fever

> and rash, should effectively limit potential spread.49 Equally important

is

> the need to ensure that the vaccine program develops slowly, with

> flexibility

> and ample time to make any necessary adjustments.

> The actual route of transmission is not revealed by these outbreaks, but

it

> may include several different paths.7,8,13,14,17 First, health care

workers

> may carry virus on their clothes, on their hands, or even in the

> nasopharynx.

> Other evidence suggests transmission by fomites,17 and the widespread

> transmission from contaminated urinary catheters14 emphasizes the need for

> rigorous cleaning of any item that comes into contact with a recently

> vaccinated person. There is also the possibility of transmission of

vaccinia

> virus by the aerosol route, since some secondary cases have occurred on

the

> same hospital floor as a bedbound source patient.7,8

> Other than those with underlying skin conditions, it is not known which

> patients are at high risk for secondary disease. Dozens of reports have

> described progressive vaccinia (also referred to as vaccinia necrosum and

> vaccinia gangrenosa) in immunocompromised patients, particularly those

with

> hematologic neoplasms (especially chronic lymphocytic leukemia),

> hypogammaglobulinemia, or defects in cellular immunity.50,51,52,53,54,55

> These infections, which are often fatal, may last for months and may

respond

> poorly to frequent doses of vaccinia immune globulin.50 Progressive

vaccinia

> in a newly vaccinated soldier with advanced, previously undiagnosed HIV

> infection has also been described.56 These studies demonstrate that

vaccinia

> may be easily transmitted to hosts with severe dermatologic disorders,

with

> substantial mortality in the absence of appropriate infection-control

> measures.

> An additional important finding from these articles is the observation

that

> secondary disease is manifested exclusively as eczema vaccinatum or

contact

> inoculation. No secondary cases of the most severe complications —

> progressive vaccinia and postvaccination encephalitis (except in those

with

> overwhelming eczema vaccinatum) — have been reported. Thus, the danger of

> nosocomial spread, though alarming, is mitigated by the limited range of

> clinical manifestations in secondary disease.

> Because of the risk of secondary transmission of vaccinia, many hospitals

> remain uncomfortable with the recent recommendation against the provision

of

> administrative leave for newly vaccinated health care workers.56 Also, the

> advisability of immunocompromised workers' remaining on the job while

> colleagues receive vaccine has not been determined. Until these

> controversies

> are settled, hospitals must be certain that the rush to vaccinate health

> care

> workers does not result in a self-inflicted epidemic — not of smallpox,

but

> of infection with the live, potentially lethal virus, vaccinia.

> Supported in part by a grant (K24 AI052239-01) from the National

Institutes

> of Health.

> I am indebted to Linda Han and Sara Tuttle for research assistance, and to

> Johan Herrlin, Roman Tuma, Gregoire Lauvau, Matthias Frank, and Svetolik

> Djurkovic for help in translating the articles cited.

>

> Source Information

> From the Infectious Disease Service, Memorial Sloan-Kettering Cancer

Center,

> New York.

>

> This article was published at www.nejm.org on December 19, 2002.

> Address reprint requests to Dr. Sepkowitz at the Infectious Disease

Service,

> Memorial Sloan-Kettering Cancer Center, 1275 York Ave., New York, NY

10021,

> or at sepkowik.

>

> References

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> of

> mass vaccination against smallpox in South Wales 1962. Trans St Johns Hosp

> Dermatol Soc 1964;50:22-42.

> 2. Conybeare ET. Illness attributed to smallpox vaccination during

1951-60.

> Mon Bull Minist Health Public Health Lab Serv 1964;23:126-133.

> 3. Haim M, Gdalevich M, Mimouni D, Ashkenazi I, Shemer J. Adverse

reactions

> to smallpox vaccine: the Israel Defense Force experience, 1991 to 1996: a

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> [iSI][Medline]

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> 7. McLachlan AD, Gillespie M. Kaposi's varicelliform eruption: an

epidemic

> of sixteen cases. Br J Dermatol Syphilol 1936;48:337-56.

> 8. Nimpfer T. Über Variola-Vaccinainfektion brandwunden im Verlaufe einer

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> Nord

> Hyg Tidskr 1941;22:257-280.

> 10. Strickler A. Kaposi's varicelliform eruption: a report of five cases,

> all

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record

> of an outbreak. Br J Dermatol 1951;63:203-214.[iSI]

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> epidemic in eczematous infants. Bull Soc Fr Dermatol Syph 1956;63:409-12.

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> vulvare da cateterismo. Minerva Pediatr 1953;5:987-990.

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> dermatological infirmary. Hospital (Rio J) 1966;69:179-186.[Medline]

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> JJ. Outbreaks of vaccinia in a Pemphigus foliaceus hospital. Arch Dermatol

> 1962;85:533-538.[iSI]

> 17. Johnson RH, Krupp JR, Hoffman AR, Koplan JP, Nakano JH, Merigan TC.

> Nosocomial vaccinia infection. West J Med 1976;125:266-270.[iSI][Medline]

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the

> literature and report of two cases of its occurrence in adults. Arch Derm

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> 19. Brain RT, Dudgeon JA, Philpott MG. Kaposi's varicelliform eruption. Br

J

> Dermatol Syphilol 1950;62:203-12.

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Kaposi's

> varicelliform eruption. Ann Paediatr Fenn 1954;1:61-73.

> 21. Copeman PWM, Wallace HJ. Eczema vaccinatum. BMJ 1964;2:906-908.[iSI]

> 22. Chaudhuri AK, Cassie R, Douglas WS. Contact vaccinia from recently

> vaccinated British soldiers. Br Med J (Clin Res Ed) 1981;282:1797-1797.

> [Medline]

> 23. Contact spread of vaccinia from a recently vaccinated Marine --

> Louisiana. MMWR Morb Mortal Wkly Rep 1984;33:37-38.[Medline]

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> vaccinia. Med Rec 1882;21:393-6.

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> 1981;81:774-775.[iSI][Medline]

> 26. Ellis FA. Eczema vaccinatum: its relation to generalized vaccinia:

> report

> of 2 cases. JAMA 1935;104:1891-1894.

> 27. Gray FG. A familial spread of vaccinia with one death: isolation and

> identification of the virus. Bull Johns Hopkins Hosp 1948;82:538-49.

> 28. Whittle CH, Lyell A, Miles JAR, Stoker MGP. Kaposi's varicelliform

> eruption, with virus studies. Br J Dermatol 1950;62:195-203.

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> 1966;68:308-310.[iSI]

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1968;17:336-336.

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> in

> a family. Dermatol Int 1969;8:5-9.[Medline]

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Arch

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> J Med 1973;288:324-325.

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> cases and a review of the world literature. Am J Obstet Gynecol

> 1963;86:460-469.[iSI]

> 38. Ayo C, Braley AE. Accidental vaccinial infection of the nose: review

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> the literature and report of a case of laboratory infection. Arch

> Otolaryngol

> 1942;36:556-559.

> 39. Brav A. Accidental vaccinia of the eyelid with disciform keratitis.

Arch

> Ophthalmol 1945;33:67-67.[iSI]

> 40. Vaccinia. BMJ 1971;1:121-121.

> 41. Horgan ES, Haseeb MA. Some observations on accidental vaccinations on

> the

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> in El Salvador. Am J Trop Med Hyg 1967;16:332-338.[iSI][Medline]

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> dermatitis in Oregon schoolchildren. J Am Acad Dermatol 2000;43:649-655.

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> Med 2002;346:1300-1308.[Full Text]

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> 50. Hall GFM, Cunliffe AC, Dudgeon JA. Prolonged generalized vaccinia. J

> Pathol Bacteriol 1953;66:25-38.[iSI]

> 51. Kozinn PJ, Sigel MM, Gorrie R. Progressive vaccinia associated with

> agammaglobulinemia and defects in immune mechanism. Pediatrics

> 1955;16:600-608.[Abstract]

> 52. Erichson RB, McNamara MJ. Vaccinia gangrenosa: report of a case and

> review of the literature. Ann Intern Med 1961;55:491-498.[iSI]

> 53. O'Connell CJ, Karzon DT, Barron AL, Plaut ME, Ali VM. Progressive

> vaccinia with normal antibodies: a case possibly due to deficient cellular

> immunity. Ann Intern Med 1964;60:282-289.[iSI]

> 54. Fulginiti VA, Kempe CH, Hathaway WE, et al. Progressive vaccinia in

> immunologically deficient individuals. Birth Defects Orig Artic Ser

> 1968;4:129-145.

> 55. Dixon MF. Progressive vaccinia complicating lymphosarcoma. J Pathol

> 1970;100:53-67.[iSI][Medline]

> 56. Redfield RR, Wright DC, James WD, Jones TS, Brown C, Burke DS.

> Disseminated vaccinia in a military recruit with human immunodeficiency

> virus

> (HIV) disease. N Engl J Med 1987;316:673-676.[iSI][Medline]

>

> The New England Journal of Medicine is owned, published, and copyrighted ©

> 2003 Massachusetts Medical Society. All rights reserved.

>

>

>

> Jock Doubleday

> Director

> Natural Woman, Natural Man, Inc.

> A California Nonprofit Corporation

> P.O. Box 1794

> Ojai, CA 93024

> http://www.gentlebirth.org/nwnm.org

> jockdoubleday

>

> The information contained in this email is not a substitute for

professional

> caregiver advice.

>

> Jock Doubleday is the author of Spontaneous Creation: 101 Reasons Not To

> Have

> Your Baby in a Hospital. He is also active in the international endeavor

to

> bring the dangers of vaccination to light.

>

>

> " The study of the evolution of disease patterns provides evidence that

> during

> the last century doctors have affected epidemics no more profoundly than

did

> priests during earlier times. Epidemics came and went, imprecated by both

> but

> touched by neither. They are not modified any more decisively by the

rituals

> performed in medical clinics than by those customary at religious

shrines. "

> Ivan Illich

> Limits to Medicine, page 15

>

>

>

>

>

> ********************************

>

> Paranormal_Research - Scientific Data & Health Conspiracies

> Paranormal_Research

> Subscribe:... Paranormal_Research-

>

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