Pandemic 2009 H1N1 virus infection associated with purpuric skin lesions: a case report
© Urso et al; licensee BioMed Central Ltd. 2011
Received: 7 May 2010
Accepted: 1 April 2011
Published: 1 April 2011
The influenza virus infection may be severe in non-immune people. Common complications of influenza virus include upper and lower respiratory tract infections, otitis media, myocarditis, acute respiratory distress syndrome and multi-organ failure. There have been cases of vasculitis following influenza vaccination, and rash and acute purpura may occur in certain viral infections. To the best of our knowledge, there are no reports concerning cases of systemic vasculitis associated with pandemic 2009 (H1N1) infection.
A 23-year-old Caucasian woman was hospitalized at the "L. Spallanzani" National Institute for Infectious Diseases in Rome, Italy. Clinical and radiological features including laboratory findings of this case are illustrated. Notably, the patient had fever, severe abdominal pain, hematuria, arthritis, and purpuric manifestations associated with a normal platelet count. Nasopharyngeal and rectal swabs revealed pandemic 2009 (H1N1) virus by reverse-transcriptase-polymerase-chain-reaction assay. Routine laboratory analyses showed elevated inflammatory parameters. The autoimmune panel tests were normal. Steroid therapy associated with oseltamivir achieved an evident and rapid improvement. On day seven the patient chose to leave the hospital against medical advice.
Complications related to influenza infection can be life threatening, particularly in immunocompromised patients. Henoch-Schönlein purpura triggered by the novel influenza virus infection could be an attractive pathogenetic hypothesis. We have discussed both the diagnosis and the challenge of therapy protocols. Steroid therapy is part of the management of severe vasculitis. Our case suggests that steroid therapy associated with antivirals can prevent the risk of further complications such as hemorrhage and multi-organ failure during severe vasculitis, without enhancing the virulence of the influenza virus. The possible role of pandemic 2009 (H1N1) in the pathogenesis of hemorrhagic manifestations should be further investigated.
No cases of vasculitis were ever reported during the pandemic 2009 H1N1 (2009 H1N1) infection, thus its occurrence can be considered rare with undetermined etiology. Systemic vasculitis has been described as an extremely rare event during influenza infection or following the administration of vaccines [1–4]. In addition, influenza infection has seldom been associated with various autoimmune diseases . Among viral respiratory diseases, adenovirus and enteroviruses were previously identified in patients with the onset of rash and cutaneous vasculitis [2, 6]. Pandemic 2009 H1N1 had a broad clinical spectrum. The majority of 2009 H1N1 infections are mild and self limiting; however, since the virus can cause serious respiratory disorders in young people and lead to severe complications in non-immune people, early treatment is recommended . In the spring of 2009, the 2009 H1N1 virus spread rapidly throughout the world. The authors describe a case of systemic vasculitis that occurred in an Australian woman suffering from 2009 H1N1 infection. She was hospitalized at the "L. Spallanzani" National Institute for Infectious Diseases (INMI).
A 23-year-old Caucasian woman spending her holidays in Italy was admitted to INMI in Rome. The otherwise healthy patient presented with a two-day history of fever, severe abdominal pain, diarrhoea with bloody stools and haemorrhagic skin lesions.
The rash that can occur during influenza virus infection usually has a macular or maculopapular aspect and can be confused with measles. Hope-Simpson and Higgins  found that approximately 8% of influenza B infections and 2% of influenza A virus infections are associated with rash. In addition, Silva and others  described a case of a child with a febrile petechial rash associated with influenza A virus infection.
Although cases of vasculitis have occurred following influenza vaccination [3, 4], to our knowledge there are no reports concerning cases of systemic vasculitis associated with the 2009 H1N1 infection. An immune thrombocytopenic purpura following human papillomavirus vaccination has been reported . Other vasculitic conditions and sepsis were excluded.
The etiology of Henoch-Schönlein purpura (HSP), which is a systemic vasculitis described mainly in childhood (0.013 to 0.02%), actually remains unknown . In our case, the skin and abdominal haemorrhagic manifestations associated with a normal platelet count could be related to both the 2009 H1N1 infection and HSP. Streptococcal, Mycoplasma species, adenovirus, parvovirus and coxsackievirus infections have been reported to precede HSP . In our case, an upper respiratory tract infection occurred first. The main diagnostic hallmarks of HSP include clinical and histological features. In this case the clinical features of HSP such as fever, purpuric rash, bloody stools, hematuria, abdominal pain, joints and kidney involvement, and normal platelet count were present. We did not perform a biopsy of the skin lesions because of the voluntary discharge of the patient.
Vasculitis may result from the interaction between influenza virus antigen A H1N1 and the host's immune response. It has been hypothesized as being a pathogenetic immune-mediated mechanism induced by infections [10, 11]. Deregulation of cytokine biosynthesis has been considered the fundamental pathogenetic mechanism related to the severity and progression of 2009 H1N1 influenza . Particularly, the secretion of Th1 and Th17 cytokines was reported as an early host response in severe 2009 H1N1 infection  and it is well known that these cytokines are also involved in inflammatory and autoimmune responses . The pro-inflammatory immune response may facilitate the occurrence of vasculitis during a severe pandemic infection.
The spectrum of treatment against vasculitis during influenza infection has been broadly discussed. Steroid therapy was not absolutely contraindicated during 2009 H1N1 infection as reported in the scientific literature. Quispe-Laime and others reported that in patients with H1N1 influenza affected by severe respiratory complications, treatment with a prolonged, moderate dose of corticosteroids was associated with significant improvement in lung injury, multiple organ function scores and low hospital mortality . Carter MJ et al. argued that steroids can have an additional role to antiviral therapy in the treatment of severe cases of H5N1 avian flu . In our case, on the basis of a high clinical suspicion of severe vasculitis syndrome and considering the rapid impairment of the clinical conditions, a short-course of steroid therapy was added to the antiviral drugs. Despite the steroid therapy, by Day 6 the nasopharyngeal swab did not show evidence of the presence of 2009 H1N1 virus by RT-PCR. Randomized clinical trials are needed to determine whether additional steroid treatment could be beneficial to dominate spreading of the cytokines, which occurs in severe pandemic H1N1 influenza.
Systemic vasculitis associated with 2009 H1N1 infection is extremely rare. In this case, the role of the 2009 H1N1 influenza virus in the pathogenesis of hemorrhagic manifestations should be considered. The lack of a histopathological study of the skin lesions may limit our conclusions; however, the macroscopic characteristics of the purpura suggest a vasculitic process. Overall, the clinical, immunological and radiological features are consistent with the clinical diagnosis of HSP. In our case, a short course of steroid therapy in addition to antivirals did not delay the clearance of 2009 H1N1 virus and the combined treatment contributed to improving a complicated case of vasculitis.
Written informed consent was obtained from the patient for the publication of this case report and accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
- 2009 H1N1:
pandemic 2009 H1N1
"L. Spallanzani" National Institute for Infectious Diseases.
We thank Mr. Nicola De Marco for his contribution of the images and we are grateful to Mr. Pierluca Piselli for the graphics support. There was no financial support for this study.
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