Volume 17, Number 2—February 2011
Hepatitis E Virus and Neurologic Disorders
Information about the spectrum of disease caused by hepatitis E virus (HEV) genotype 3 is emerging. During 2004–2009, at 2 hospitals in the United Kingdom and France, among 126 patients with locally acquired acute and chronic HEV genotype 3 infection, neurologic complications developed in 7 (5.5%): inflammatory polyradiculopathy (n = 3), Guillain-Barré syndrome (n = 1), bilateral brachial neuritis (n = 1), encephalitis (n = 1), and ataxia/proximal myopathy (n = 1). Three cases occurred in nonimmunocompromised patients with acute HEV infection, and 4 were in immunocompromised patients with chronic HEV infection. HEV RNA was detected in cerebrospinal fluid of all 4 patients with chronic HEV infection but not in that of 2 patients with acute HEV infection. Neurologic outcomes were complete resolution (n = 3), improvement with residual neurologic deficit (n = 3), and no improvement (n = 1). Neurologic disorders are an emerging extrahepatic manifestation of HEV infection.
Hepatitis E virus (HEV) infection is a well-known cause of acute hepatitis in developing countries (1). However, autochthonous (locally acquired) HEV infection is also emerging in industrialized countries (1), where it is caused by HEV genotype 3 and thought to be a zoonosis transmitted by pigs (2). Within the past few years, HEV has been responsible for chronic hepatitis, which can rapidly evolve to cirrhosis, in immunocompromised patients (3–8). However, little data regarding HEV-related extrahepatic manifestations have been published, although an association between neurologic manifestations (e.g., Guillain-Barré syndrome, neuralgic amyotrophy, acute transverse myelitis) and acute HEV infection has been suggested (9–13).
Previously, the association between neurologic signs and symptoms and HEV infection has been based on detection of anti-HEV immunoglobulin (Ig) M in serum. However, Rianthavorn et al. reported a case of HEV genotype 3–induced neuralgic amyotrophy in which HEV RNA was detected in the serum of patients with neurologic signs and symptoms (14), and we recently detected HEV RNA in the cerebrospinal fluid (CSF) of a kidney-transplant recipient with chronic HEV infection and neurologic signs and symptoms (15). We describe 7 cases of HEV-associated neurologic disorders in patients from the Royal Cornwall Hospital, Truro, Cornwall, UK, and Toulouse University Hospital, Toulouse, southwestern France.
In Cornwall, among 55 patients with locally acquired hepatitis E, neurologic signs and symptoms developed among 3 (5.5%). From January 2004 through April 2009, in the organ-transplant unit of Toulouse University Hospital, among 50 solid-organ–transplant patients with HEV, neurologic signs and symptoms developed among 3 (6%). In addition, from January 2005 through December 2009, in the Department of Hepatology of Toulouse University Hospital, among 21 patients with acute HEV infection, neurologic signs and symptoms developed in 1 (4.76%). We describe these 7 cases of HEV-induced neurologic disorders, which occurred in 3 nonimmunocompromised patients with acute HEV infection, in 2 kidney transplant recipients and 1 kidney–pancreas transplant recipient with chronic HEV infection, and in 1 HIV-positive patient with chronic HEV infection (Tables 1, 2).
The diagnosis of HEV infection was based on the presence of HEV RNA in serum. Serologic analysis showed negative results for hepatitis A, B, and C viruses for all 7 patients and negative HIV results for all but 1 (patient 7). Organ-transplant recipients had negative results for HBV DNA, HCV RNA, and cytomegalovirus (CMV) DNA. Epstein-Barr virus (EBV) DNA was found in the blood of 2 patients (patients 4 and 5).
For the patients from Toulouse, anti-HEV status was determined by using Adaltis EIAgen HEV IgG and IgM kits (Ingen, Chilly Mazarin, France). For patients from the United Kingdom, HEV serology kits from Wantai (Beijing, People’s Republic of China) or Genelabs (Singapore) were used. Serum HEV RNA was detected by real-time PCR with amplification within the open reading frame 2 region (3,5,16). Detected strains were sequenced and compared with reference HEV strains (GenBank) as reported (5,17).
A 42-year-old man from Cornwall sought care for severe low-back pain, which progressed to paresthesia in the legs, then the arms, and then weakness with normal sphincter control. The man had not traveled outside the United Kingdom and had had no contact with pigs. Physical examination found weakness of his entire upper limbs and proximal legs. Pinprick sensation was impaired in areas on the right side innervated from C2–4 and distally but asymmetrically in his legs; additionally, S2–5 were involved on the right. Reflexes were diminished or absent in all 4 limbs.
CSF analysis showed high protein levels with lymphocytic pleocytosis (protein 1.27 g/L [reference 0.15–0.45 g/L], glucose 3.5 mmol/L, and leukocytes 145 × 109 cells/L [90% lymphocytes]). Magnetic resonance image (MRI) of the pelvis and lumbar spine showed no abnormalities. Nerve-conduction studies showed distal sensory and motor activity to be within normal limits for all limbs; however, substantial tibial F-wave responses after ankle stimulation were noted, with relative prolongation on the right (right 58.50 milliseconds [ms], left 47.00 ms [reference 52.3 ±4.3 ms, interleg latency difference <5.7 ms]).
Liver function tests showed serum bilirubin within reference range but elevated alanine aminotransferase (ALT) (623 IU/L [reference 3–35 IU/L]). Serologic testing was negative for Borrelia burgdorferi and Treponema pallidum. Anti-HEV IgM and IgG were detected in the serum, as was HEV RNA, confirming a diagnosis of acute HEV. Molecular characterization showed that the serum HEV was genotype 3e (GenBank accession no. FN869556). CSF was negative for HEV RNA, CMV DNA, EBV DNA, and varicella zoster virus (VZV) DNA.
The best explanation for the clinical and laboratory findings was acute inflammatory polyradiculoneuropathy. The patient was given no specific treatment; neurologic signs and symptoms resolved fully in 3 months, and laboratory parameters returned to reference range within 6 months.
A 38-year-old man from Cornwall, with type 1 diabetes had a 5-day history of diarrhea, followed by pain, paresthesia, and weakness in his upper arms. He had neither recently traveled outside the United Kingdom nor had contact with pigs. Sensation to pinprick over the C5–6 dermatomes was bilaterally reduced as was strength during elbow flexion, shoulder abduction, and external rotation (worse on the right). Electrophysiologic studies confirmed a diagnosis of bilateral brachial neuritis with denervation of the supraspinatus, infraspinatus, and triceps muscles, which was more severe on the right. CSF was not examined.
Liver function tests showed elevated total serum bilirubin (70 µmol/L [reference 3–17 µmol/L]) and ALT (1,160 IU/L [reference 3–35 IU/L]). Serum was positive for anti-HEV IgG, anti-HEV IgM, and HEV RNA. Molecular characterization showed that the HEV isolated from the serum was genotype 3e (GenBank accession no. FN869555).
The patient was given no specific treatment. Within 6 weeks, liver enzyme levels returned to reference range and HEV RNA became undetectable. Signs and symptoms of brachial neuritis and other neurologic deficits gradually improved over the next 18 months, but residual weakness in his upper right arm remained.
A 60-year-old woman from Toulouse, France, with type 1 diabetes, had a 1-week history of severe asthenia, jaundice, and progressive weakness in her legs. She had no history of recent travel outside France or contact with animals. She was bedridden with lower limb weakness and complete loss of deep-tendon reflexes but no paresthesia. She had no fever and no biological markers of inflammation, i.e., C-reactive protein was <1 mg/L. CSF protein was 2g/L, glucose 6.2 mmol/L, and leukocyte count 14 × 109 cells/L. Liver function tests showed elevated total serum bilirubin (35 µmol/L [reference 2–21 µmol/L]) and elevated ALT (384 IU/L [reference 5–45 IU/L]). C-reactive protein and creatinine phosphokinase levels were within normal limits. Anti-HEV IgM and IgG were detected in the serum. HEV RNA was also detected in serum and fecal samples, confirming a diagnosis of acute HEV. Molecular characterization showed that the serum HEV was genotype 3f (GenBank accession no. EU 221001.1). CSF was negative for HEV RNA.
The patient’s clinical and laboratory findings are best explained by acute inflammatory demyelinating polyneuropathy (Guillain-Barré syndrome) associated with HEV infection. She was given intravenous immunoglobulin at 0.4 g/kg 1×/d for 5 days. Neurologic signs and symptoms improved rapidly, and liver enzyme levels progressively returned to reference limits within 4 weeks. HEV RNA became undetectable 1 month after initial examination. Her neurologic condition gradually improved over the next 18 months, but residual weakness in her lower limbs remained.
In a 60-year-old man, acute autochthonous HEV (genotype 3f; GenBank accession no. EU221003) infection developed 27 months after a kidney–pancreas transplant. Acute polyradiculoneuropathy with moderate ataxia and severe proximal weakness of his lower limbs developed 30 months after HEV infection, occurring concomitantly with severe cognitive impairment and intermittent frontal dysfunction. CSF protein was 0.71 g/L, glucose 2.9 mmol/L, and leukocyte count 1 × 109 cells/L. MRI of the cerebrum showed an old lenticular infarction and no acute changes. MRI of the spine showed no abnormalities.
Immunosuppressive therapy for transplantation was a combination of tacrolimus (trough level 6 ng/mL), mycophenolate mofetil, and low-dose prednisolone (5 mg/d). Liver function test results showed total bilirubin within normal limits (19 µmol/L [reference 2–21 µmol/L]) but elevated ALT (173 IU/L [reference 5–45 IU/L]). Liver biopsy sample showed features of chronic active hepatitis; Metavir score was A2F3. CD4 count was 219 × 109 cells/L Serum HEV RNA concentration was 1,572 copies/mL. CSF was negative for anti-HEV IgG but positive for anti-HEV IgM. HEV RNA was detected in CSF obtained at the time of admission. CSF contained no detectable CMV DNA, EBV DNA, Herpes simplex viruses 1 and 2 DNA, VZV DNA, JC virus DNA, cryptococcal antigen, Toxoplasma gondii DNA, or Candida spp.
Because the patient was aphasic, confused, and drowsy, tacrolimus was replaced by low-dose sirolimus. After 10 days, neurologic signs and symptoms improved. However, 10 months later, despite rehabilitation and physiotherapy, motor deficit in the lower limbs remained and he was still unable to walk. Four months after conversion from tacrolimus to sirolimus, HEV RNA became undetectable in the serum and remains so as of September 2010. The patient declined follow-up lumbar puncture.
In a 35-year-old man, acute autochthonous HEV (genotype 3f; GenBank accession no. EU220999) infection developed 48 months after kidney transplantation. Three years later, drowsiness and fever (38°C) developed, and neurologic assessment revealed signs and signs and symptoms of encephalitis characterized by confusion and drowsiness without focal signs. CSF protein was 0.8 g/L, glucose 2.5 mmol/L, and leukocyte count 8 × 109cells/L. Initial computed tomographic scan of the brain showed no abnormalities. However, a few hours later, his level consciousness deteriorated and he required mechanical ventilation. Cerebral MRI, performed 24 hours later, showed features of encephalitis with diffuse white matter signal abnormalities in the supratentorial and infratentorial regions.
Immunosuppressive therapy was a combination of tacrolimus (trough level 3 ng/mL), mycophenolate mofetil, and low-dose prednisolone (5 mg/d). Liver function tests showed total bilirubin level within reference range (12 µmol/L [reference 2–21µmol/L]) and an elevated ALT level of 110 IU/L (reference 5–45 IU/L). A liver biopsy sample showed features of chronic active hepatitis; Metavir score was A2F2. CD4 count was 149 × 109 cells/L Serum EBV DNA concentration remained unchanged from 6 months earlier, at 4.24 log10 copies/mL. Serum was positive for anti-HEV IgM but negative for anti-HEV IgG. Serum HEV RNA concentration was 2,154,000 copies/mL. CSF was negative for anti-HEV IgG and IgM. HEV RNA and EBV DNA were detected in CSF obtained at the time of admission. CMV DNA, Herpes simplex 1 and 2 DNA, VZV DNA, JC virus DNA, cryptococcal antigen, Toxoplasma gondii DNA, and Candida spp. were absent in the CSF.
Immunosuppressive therapy was stopped, and Foscavir (6 g/d) and intravenous immunoglobulins (total dose 2 g/kg) were added to the broad spectrum antimicrobial drugs given since admission. MRI showed improvement by day 10, and the patient was extubated. Two months later, despite the absence of neurologic signs and symptoms, CSF protein was 1 g/L, glucose 4.9 mmol/L and leukocyte count 16 × 109 cells/L (96% lymphocytes). HEV RNA and EBV DNA were still detected in the serum and CSF. One year later, HEV spontaneously cleared from serum, but the patient declined a third lumbar puncture.
In a 44-year-old man from Toulouse, France, acute autochthonous HEV (genotype 3f; GenBank accession no. FJ665423) infection developed 50 months after a kidney transplant (15). After 33 months of chronic HEV infection, the patient experienced progressive bilateral muscular weakness, difficulty walking, and palmar and plantar dysesthesia without fever. Neurologic examination revealed peripheral nerve involvement (with proximal muscular weakness that affected all limbs) and central nervous system involvement (bilateral pyramidal signs). Electrophysiologic studies showed signs of peripheral demyelinating polyradiculoneuropathy. MRI of the cerebrum showed no abnormalities. CSF protein was 0.76 g/L, glucose 3.9 mmol/L, and leukocyte count 7 × 109 cells /L.
Immunosuppressive therapy consisted of tacrolimus (trough level 8 ng/mL), mycophenolate mofetil (1 g/d), and low-dose prednisolone (2.5 mg/d). Liver function tests showed total bilirubin level within normal limits (12 µmol/L [reference 2–21]) and elevated ALT level (105 IU/L [reference 5–45 IU/L]). Liver biopsy sample showed cirrhosis; Metavir score was A2F4. Serum CD4-positive count was 167 × 109 cells/L. Serum, but not CSF, contained anti-HEV IgG and IgM. Serum HEV RNA was 260,000 copies/mL, and HEV RNA was detected in CSF. No signs of infection were detected in the serum and CSF, except for EBV DNA, which had remained detectable in the blood since transplantation and at an unchanged concentration of 4.4 log10 copies/mL.
After 3 months, because the patient had severe ataxia and loss of sphincter control, neuromuscular biopsy was performed and showed nonspecific signs of neurogenic muscular atrophy but no signs of vasculitis in either muscule or nerve specimens. Consequently, the tacrolimus dosage was markedly reduced to target a trough level of 2.5 ng/mL, and intravenous immunoglobulins were administrated (0.4 g/kg/d for 5 days, total dose 2 g/kg). However, no substantial improvement was observed. After another month, decompensated cirrhosis developed and the patient died of bleeding esophageal varices.
A 48-year-old man from Cornwall was examined for persistently abnormal liver function that was complicating HIV disease. HIV-1 infection had been diagnosed in 2001 when the patient lived in Cambodia; he was subsequently treated for miliary tuberculosis in 2003.
When back in the United Kingdom, before receiving any antiretroviral medications, the patient had mildly elevated ALT (51 IU/L, reference 3–35 IU/L); other liver enzymes were within reference range. CD4 count was 30 × 109 cells/L, and HIV-1 viral load was 8.3 × 104 copies/mL. Accordingly, in January 2007, the patient was given tenofovir/emtricitabine and lopinavir/ritonavir. In February 2007, the regimen was changed to abacavir/lamivudine and efavirenz; after this time, because the patient had difficulty tolerating these drugs, the regimen was again changed to abacavir/lamivudine and lopinavir/ritoanvirfor, which led to serum HIV RNA clearance in June 2007. In March 2007, ALT had risen to 114 IU/L, but there was no serologic evidence of syphilis or acute hepatitis A, B, or C. From July 2007 through July 2009, ALT remained elevated (118–195 IU/mL). In July 2007, HEV IgM and IgG were detected by enzyme immunoassay. HEV infection was confirmed by detection of HEV RNA (genotype 3a; GenBank accession no. FN869554) in serum. Testing of stored plasma samples for HEV RNA showed that the patient had been viremic since July 2007 and had remained so for 30 months, confirming chronic HEV infection. Liver biopsy sample showed cirrhosis; Metavir score was A3F4. The time HEV infection was acquired and its geographic origin remain uncertain.
In 2005, soon after completing antituberculous chemotherapy, the patient experienced progressive and painful sensory peripheral neuropathy with decreased pinprick sensation and proprioception and weakness in the distal lower limbs. At the time, these neurologic signs and symptoms were thought to have resulted from either HIV-associated neuropathy or previous isoniazid-containing antituberculous chemotherapy. In May 2009, CSF contained 0.47 g protein/L, 3.2mmol glucose/L, 1 × 109 leukocytes/L and HEV RNA.
In July 2009, because of chronic HEV liver infection, the patient was given pegylated interferon-α-2a and ribavirin. During the course of this treatment, the neurologic signs and symptoms improved, and by the time the virus cleared, they were virtually gone. One month after completion of therapy and symptom resolution, CSF levels of protein, glucose, erythrocytes, and leukocytes were within reference range; however, HEV RNA was still detected. An exact estimate of HEV viral load was not performed, but the semiquantitative technique used showed substantial reduction of HEV (barely detectable) in a follow-up CSF sample.
Data about neurologic sequelae of HEV infection are scarce and come mainly from the Indian subcontinent. These data probably refer to HEV genotype 1 infection because this is the predominant genotype in this area.
In industrialized countries, autochthonous HEV infection has been described for a large number of persons who have not traveled to areas where HEV has traditionally been considered endemic (1). Hepatitis E for these persons is thought to be a porcine zoonosis and is generally caused by HEV genotype 3 (and genotype 4 in the People’s Republic of China and Japan). The clinical features of hepatitis E in persons in industrialized countries are quite distinct from those in developing countries: HEV occurs most often in middle-aged and elderly men, and associated mortality rate is 5%–10% (1). Information about the spectrum and magnitude of disease caused by HEV genotype 3 is still emerging. For example, in recent years chronic HEV infection (with rapid development of cirrhosis) in immunocompromised persons has been demonstrated (3–8).
For the 7 cases of HEV genotype 3 infection with associated neurologic disorders reported here, the spectrum of neurologic injury associated with HEV infection was quite wide and was found in patients with acute and chronic HEV infection. However, these neurologic signs and symptoms can be divided in 2 clinical pictures. The first and dominant clinical picture is peripheral nerve involvement, which was observed for 5 of the 7 patients. These 5 patients had acute or chronic polyradiculoneuropathy. In these cases, proximal peripheral nerve involvement was similar to that associated with immune or other infectious diseases. In addition to this dominant clinical picture, 1 patient had central and peripheral manifestations, and 1 patient had encephalitis. Only 1 of the 2 patients had fever, and meningitis with lymphocytic CFS was mild or absent in that patient.
For several reasons, we think that the association between HEV genotype 3 infection and the neurologic signs and symptoms in the 7 patients reported here is causal. First, similar neurologic illnesses have been described in 2 clinically and geographically distinct populations. Second, for all patients, the diagnosis of HEV was confirmed by molecular techniques, which excludes the possibility of cross-reacting antibodies causing a spurious association between HEV infection and neurologic illness. Third, HEV RNA was detected in the CSF of some patients. Finally, there was a temporal association between clearance of HEV viremia and resolution of the neurologic signs and symptoms.
The mechanisms of neurologic damage in our patients are unknown. Many viruses (including hepatotropic viruses) trigger neurologic signs and symptoms, especially Guillain-Barré syndrome (18). Such infections may elicit an immune response that cross-reacts with axolemmal or Schwann cell antigens and thereby damages peripheral nerves (18). Among the 7 cases reported here, HEV RNA was detected in the CSF of 4 patients with chronic HEV infection and neurologic signs and symptoms, suggesting that local viral replication is occurring in the central nervous system, which may cause direct neuronal damage. Additional evidence for viral replication in the central nervous system is the discovery that different HEV quasispecies coexisted in the serum and CSF of a patient with chronic HEV infection (patient 6) (15). Neurologic signs and symptoms may result from infection with, or emergence of, neurotropic HEV variants (15).
On the basis of our observations, we are unable to estimate how frequently HEV genotype 3 infections cause neurologic damage. In the series of (mainly) acute cases in the United Kingdom, neurologic signs and symptoms were present in ≈5% of patients; in the series of chronic HEV infection in Toulouse, incidence was ≈6%. The true rate of neurologic sequalae associated with HEV 3 infection may be higher because autochthonous genotype 3 infections in industrialized countries are not widely recognized by many clinicians (including neurologists). This may be partly because of the understated clinical presentation of HEV infection. Only 1 patient reported here was icteric at the time of initial examination, and liver function test results of the immunocompromised patients were only modestly elevated. HEV-induced neurologic disorders occurred with 3 subtypes of HEV (i.e., HEV 3a, HEV 3e, and HEV 3f). These data indicate that neurologic injury induced by HEV genotype 3 is not subtype specific; because subtypes a, e, and f are found throughout Europe and North America, the geographic range of disease may well be extensive.
In conclusion, neurologic signs and symptoms are an emerging extrahepatic manifestation of HEV genotype 3 infection. We recommend that clinicians strongly consider the possibility of HEV infection in patients with neurologic disorders, especially those with peripheral nerve involvement and liver abnormalities indicated by blood tests. The diagnosis may be suggested by HEV serology but should be confirmed by molecular documentation of HEV RNA in the serum, CSF, or both.
Dr Kamar is professor of nephrology in charge of the Organ Transplant Unit, Toulouse University Hospital. His research interests are immunosuppressive therapy in transplant patients (heart, liver, kidney, and kidney–pancreas) and virus infections (particularly those caused by hepatitis C virus, HEV, and CMV) that develop after solid-organ transplantation.
We thank Marcello Jones for his help with the manuscript.
The Royal College of Physicians (London) awarded the Dame Sheila Sherlock Travelling Fellowship to H.R.D. and R.P. to facilitate this collaborative project. Travel and accommodation costs of H.R.D. were reimbursed by GlaxoSmithKline and Wantai Pharmaceutical Company.
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Suggested citation for this article: Kamar N, Bendall RP, Peron JM, Cintas P, Prudhomme L, Mansuy JM, et al. Hepatitis E virus and neurologic disorders. Emerg Infect Dis [serial on the Internet]. 2011 Feb [date cited]. http://dx.doi.org/10.3201/eid1702.100856