Clinicians urged to consider parvovirus B19 in people with fever, myalgia, arthralgia, and rash, after US and Europe report increased cases
Recent data indicates an increase in parvovirus B19 activity, the virus responsible for erythema infectiosum. Since March 2024, there has been a significant rise in cases reported in 14 European countries, and in August 2024, the US Centers for Disease Control and Prevention (CDC) issued a Health Alert about increased activity in the US.[13][14] The surge in cases has affected all age groups, with the largest increase seen among children ages 5-9 years. Reports also indicate a higher incidence of infections among pregnant individuals, with an increased number of fetal complications.[15]
Clinicians should maintain increased suspicion for infection with parvovirus B19 in people presenting with common symptoms (e.g., fever, myalgia, malaise, reticular rash, arthralgia, characteristic facial rash) or for pregnant people with known exposure to individuals with parvovirus B19.[15]
Summary
Definition
History and exam
Key diagnostic factors
- close contact with other infected individuals
- bright red macular erythema of the bilateral cheeks with sparing of the nasal ridge and perioral areas
- erythematous macules and papules evolving into lacy reticular erythema, most notable on the extremities
- immunodeficiency
Other diagnostic factors
- arthralgia/arthritis
- prodrome (fever, headache, pharyngitis, coryza, abdominal pain)
- symptoms of anemia
Risk factors
- close contact with other infected individuals
- immunodeficiency
- age 6 to 10 years
Diagnostic tests
1st tests to order
- clinical diagnosis
Tests to consider
- CBC
- reticulocyte count
- serology
- DNA assays
Treatment algorithm
fever
secondary arthritis
persistent (>3 weeks) parvovirus B19 infection
Contributors
Authors
Joseph M. Lam, MD
Clinical Associate Professor, Department of Pediatrics
Associate Member, Department of Dermatology and Skin Sciences
University of British Columbia, BC Children’s Hospital
Vancouver
BC
Canada
Disclosures
JML declares that he has no relevant competing interests.
Alexander K. C. Leung, MD
Department of Pediatrics
The University of Calgary, Alberta Children's Hospital
Calgary
Alberta
Canada
Disclosures
AKCL declares that he has no relevant competing interests.
Acknowledgements
Dr Joseph M. Lam and Dr Alexander Leung would like to gratefully acknowledge Dr Kari L. Martin, Dr Christine T. Lauren, Dr Jon Dyer, and Dr Jennifer Holman, the previous contributors to this topic. KLM has served as a board member for Women's Dermatologic Society and American Contact Dermatitis Society. CTL, JD, and JH declare that they have no competing interests.
Peer reviewers
Nevio Cimolai, MD
Professor
Department of Pathology and Laboratory Medicine
Children's and Women's Health Centre of British Columbia
Vancouver
Canada
Disclosures
NC declares that he has no competing interests.
Differentials
- Rubella
- Measles infection
- Roseola infantum
More DifferentialsGuidelines
- Parvovirus B19 and fifth disease
- Cytomegalovirus, parvovirus B19, varicella zoster, and toxoplasmosis in pregnancy
More Guidelines
Log in or subscribe to access all of BMJ Best Practice
Use of this content is subject to our disclaimer