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Focal and Generalized Folliculitis Following
Smallpox Vaccination Among Vaccinia-Naive Recipients
Thomas R. Talbot, MD, MPH; H. Keipp Bredenberg,
MD; Michael Smith, MD; Bonnie J. LaFleur,
PhD; Alan Boyd, MD; Kathryn M. Edwards, MD
JAMA. 2003;289:3290-3294.
Context With the reintroduction of smallpox
vaccination, detailed contemporary descriptions of
adverse reactions to the vaccine are needed to adequately
inform the public and clinicians. During a multicenter,
randomized controlled trial investigating the efficacy of
various dilutions of smallpox vaccine, we observed the
appearance of a papulovesicular eruption (focal and generalized)
in study volunteers.
Objective To characterize the papulovesicular eruptions
by clinical, virologic, and histopathological characteristics.
Design, Setting, and Participants Prospective case series
of papulovesicular eruptions following smallpox vaccination
in healthy, vaccinia-naive adult participants compared with
noncases conducted from October 2002 to March 2003. Variables
potentially related to these eruptions were collected
retrospectively through chart review. Eruptions were
described based on viral culture, clinical examination,
and histopathological evaluation (1 biopsy specimen from
1 case).
Main Outcome Measure Cases of papulovesicular eruptions
following vaccination.
Results During the trial, of 148 volunteers (56% women;
mean age 23.6 years), 4 participants (2.7%) developed
generalized eruptions and 11 (7.4%) noted focal
eruptions. Viral cultures of sample lesions were negative
for vaccinia. The result of a skin biopsy sample from 1
case of generalized rash revealed suppurative
folliculitis without evidence of viral infection. All
lesions resolved without scarring. In the cohort, cases
and noncases did not show significant differences in terms of
sex, in the use of nonsteroidal anti-inflammatory drugs or
oral or depo contraceptives, in medication allergies, in
the incidence of fever or lymphadenopathy after
vaccination, or in the dilution of vaccine received.
Conclusions Folliculitis is a common and benign eruption
observed in vaccinia-naive adult volunteers following smallpox
vaccination. This eruption may be seen in volunteers receiving
the vaccine in the newly instituted vaccination programs and
may be met with heightened anxiety, potentially being confused
with generalized vaccinia. This description of folliculitis
using clinical, virologic, and histopathological findings
should allay these concerns and provide additional
insight into this eruption.
Author Affiliations: Departments of Medicine (Drs Talbot,
Bredenberg, Smith, and Boyd), Pediatrics (Drs Smith and Edwards),
Preventive Medicine (LaFleur), and Pathology (Dr Boyd), Vanderbilt
University School of Medicine, Nashville, Tenn.
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